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International audience; PurposeInformation and communications technology (ICT) plays a key role in higher education in improving the teaching process. Consequently, the environmental impacts associated with ICT are increasing, and innovative solutions must be deployed to reduce these impacts and increase students’ awareness. Single-board computers (SBCs) are promising because they rely on less materials and energy than desktop computers (PCs). But additional servers are required to perform large-scale computations. Hence, this paper aims at conducting comparative LCA between SBCs and PCs.Materials and methodsThe study is conducted in the context of a French engineering school with the following functional unit: “use 600 computers for 5 years in an engineering school.” Two scenarios are defined to fulfil this functional unit. Scenario 1 is the use of 600 PCs (current infrastructure), and scenario 2 is the use of 600 SBCs combined with 6 servers (alternative infrastructure). The analysis includes the materials manufacturing, assembly, packaging, transport, use and end-of-life of each device. Life cycle inventory (LCI) of the foreground systems was generated using a variety of sources: disassembly of computers, counting of electronic components, datasheets, estimations, etc. LCI of the background systems is taken from ecoinvent 3.5. The selected life cycle impact assessment methodology is ReCiPe 2016 midpoint, and computation of impacts is done with openLCA 1.10.3.Results and discussionScenario 2 (SBCs + servers) generates 84 to 92% less impact than scenario 1 (PCs) in all categories. In terms of global warming, scenarios 1 and 2 generate 225 and 18 tCO2 eq per functional unit, respectively. This is explained by the large reduction in material and energy requirements for SBCs which is not counterbalanced by the servers. Equipment manufacturing accounts for the largest share of impacts in most categories for both scenarios (e.g., ~70% for global warming), followed by the use phase. This differs from the results found in the literature, as this study was conducted in the context of France, which has a low-carbon electricity mix.ConclusionsOur analysis has shown that SBCs combined with servers reduce the carbon footprint and other environmental impacts of ICT infrastructure for higher education. This study provides an example of low tech-oriented solution for students. Other prospective solutions (e.g., use of laptops) should be extensively studied in the future. From an LCA point of view, updating the inventory data related to background processes for electronic components is a necessary step forward to improve the certainty of the results.

After the rare earth element (REE) crisis in 2011, companies invested in new supply routes of REEs, such as the recycling from end-of-life fluorescent lamps. Although recycling is in the current market situation not economically profitable anymore, it does fit in a strategy towards a low-carbon and a circular economy, for example to mitigate the supply risk of REEs. However, is recycling of REEs indeed environmentally beneficial? Should their recycling therefore be subsidized? This is assessed with a Consequential Life Cycle Assessment (CLCA). The results show that the answer to this question strongly depends on the market situation of the REEs, and the applications in which they are used. At the time that the recycling process was operating—where fluorescent lamps could still displace halogen lamps and there was sufficient demand for the REE europium and yttrium—environmental benefits could be achieved by increasing the recovery of REEs from end-of-life fluorescent lamps. The results of this study can be used to increase the understanding on the type of market interactions that could be considered in the decision-making processes regarding the supply and recycling of raw materials—especially materials that are often produced as by-products, such as many critical raw materials.

By analogy to conventional environmental impacts, the potential release of debris or generation of fragments can be considered as the emission of an environmental stressor damaging the orbital ‘natural’ resource which supports space activities. Hence, it appears relevant to integrate systematically the impact of the emission of debris on the orbital resource within the life cycle impact assessment (LCIA) step to broaden the scope of life cycle assessment (LCA) for space systems. The main objective of this article is to propose a set of characterization factors to compute the impact caused by the generation of debris within the orbital environment. To do so, the proposed approach follows the methodology of emission-related characterization models in LCIA. the characterization model enables to link the emission of debris and final economic damages to space activities through a complete impact pathway including the fate of debris in downstream orbital compartments, the exposure of targeted space objects to this debris, and the economic damage in case of collision between the debris and the space object. The model is computed for different compartments of the low earth orbit (LEO) region thanks to a discretization of the orbital environment. Results show that the potential damages are the highest for orbital compartments located in the orbital bands of altitude/inclination: 550–2000 km/52–54°, 1,200–2000 km/86–88°, 400–2000 km/96–100°, because of the downstream location of Starlink constellation, OneWeb constellation, and earth observation satellites, respectively. The proposed set of CFs can be used in the LCA of different space systems in order to include impacts and damages related to space debris, along with other environmental impacts. This original development fully in line with the standardized LCIA framework would have potential for further integration into harmonised sector-specific rules for the European space sector such as product environmental footprint category rules (PEFCR).

Packaging is fundamental for food preservation and transportation but generates an environmental burden from its production and end-of-life management. This review evaluates packaging contribution to the environmental performance of seafood products. Life cycle assessment (LCA) studies were evaluated by both qualitative and quantitative analysis. The qualitative analysis assessed how direct (e.g., packaging material) and indirect impacts (e.g., influence on seafood loss and waste) have been considered, while the quantitative analysis evaluated packaging contribution to products’ weight and climate change impact. Qualitative analysis revealed that seafood LCAs focus mainly on direct environmental impacts arising from packaging materials, for which some articles conducted sensitivity analysis to assess materials substitution. Recycling was found to be the most common recommendation to diminish direct potential environmental impacts arising from packaging end-of-life. However, standardized recovery rates and other end-of-life options (e.g., reuse), should be considered. Quantitative analysis revealed that cans' production contributes significantly to the overall climate change impact for canned products. On average, it contributes to 42% of a product's climate change impact and 27% of a product's weight. Packaging has a lower contribution when considering freezing, chilling, and other post-harvesting processing. It represents on average less than 5% of a product's climate change impact (less than 1 kg CO2 eq/kg) and 6% of a product's weight. Packaging material production is more relevant to aluminum, tinplate, and glass than for plastic and paper. Therefore, it is essential to accurately include these materials and their associated processes in inventories to improve the environmental assessment of seafood products. This work was supported by the NEPTUNUS project (EAPA_576/2018). The authors would like to acknowledge the financial support of Interreg Atlantic Area. Ana Cláudia Dias, Paula Quinteiro and Tamíris da Costa acknowledge FCT/MCTES for the financial support to CESAM (UIDB/50017/2020+UIDP/50017/2020), through national funds, and Ana Cláudia Dias and Paula Quinteiro to the research contracts CEECIND/02174/2017 and CEECIND/00143/2017, respectively. peer-reviewed 2022-08-24

How to apply allocation in an life cycle assessment (LCA) is a long-running and controversial debate. Consensus seems to exist on the fact that the allocation procedure should follow logically from the LCA goal definition. This paper proposes to use an axiomatic method to (1) identify an allocation procedure for co-production, joint treatment, and recycling, that best responds to a specific LCA goal and (2) communicate the rationale applied by the LCA practitioner transparently. The method is illustrated via a case study. The specific goal definition for which a suitable allocation procedure is identified is to evaluate what impacts can be attributed to a product, which could inform a company about potential sources of reputation damage. Subjective assumptions that reflect our vision of “what impacts can be attributed to a product” are described in definitions and axioms. Axioms are formulated that describe the system boundaries of the product system and the partitioning criterion. The derived allocation procedure corresponds to “Allocation at the Point of Substitution,” which is applied in one of the system models of ecoinvent. Partitioning is based on market information, which corresponds to a cause-oriented perspective on “what impacts can be attributed to a product.” Other LCA goal definitions and rationales could require different system boundaries or a different partitioning criterion. The axiomatic method presented in this paper supports the identification of a suitable allocation procedure for a defined LCA goal and the transparent communication of the rationale that backs up this procedure. Building forth on the approach of this paper, a collection of axioms and corresponding allocation procedures could be developed on which consensus might exist within the LCA community. Such goal-dependent allocation procedures could form the basis of future guidance on LCA.

Partitioning is often recommended as allocation procedure in attributional Life Cycle Assessments (a-LCAs). However, little guidance is available on how to apply partitioning to recycled products. This paper aims to demonstrate and discuss the application of the allocation procedure allocation at the point of substitution (APOS) via an evaluation of the impacts of the recycled phosphor yttrium europium oxide (YOX) from end-of-life fluorescent lamps. Starting from a multifunctional recycling process, APOS is applied by (1) identifying the products of the foreground sub-system, (2) identifying the origin of the recycled waste, (3) defining the boundaries of the production systems, and (4) applying economic allocation. It appears that recycled YOX is accountable for lower impacts than primary YOX for most impact categories. The largest contributor to the impacts of recycled YOX are the impacts related to the primary production of the fluorescent lamp, such as the use of mercury in the lamp tube. Even if this can be counter-intuitive to accept—as these impacts seem unrelated to YOX—these results provide useful information on whether the supply route of rare earth elements (REEs) from end-of-life fluorescent lamps is “future proof,” regarding potential (supply) risks due to environmental impacts upstream in the product supply chain. The application of APOS is demonstrated on the end-of-life recycling of rare earth elements. APOS provides the user of the recycled REE information about environmental impacts upstream in the product’s value chain. This could inform about the sustainability of the company’s operations—i.e., whether the future use or production of a material might be compromised due to (regulations to decrease) environmental impacts.

This article presents an approach to integrating life cycle assessment (LCA) into an activity‐based costing (ABC) model to develop a steering system that takes into account both financial costs and associated environmental impacts. By combining the formalism of LCA and ABC matrix calculations, we show how impact assessment results can be affiliated with costs to jointly and simultaneously compute the costs and environmental impacts of products and activities. The conditions of integration are developed following the four‐step structure of LCA. The proposal is applied to a simplified case study of the ‘Classic Pen Company.’ The developed ABC‐LCA approach paves the way for further test applications, which are considered useful in the context of environmental indicators for strategic steering, communication with customers and forecasting or simulation.

Purpose Common octopus is the fishing species with highest economic revenue in Portugal, and its consumption per capita is very high. The majority of catches come from the small-scale fleet with pots and traps. The aims were to assess main environmental impacts of common octopus’ fishery with traps and pots in the Algarve region, where the most important fleet size and landings volume occurs, and to find if there are significant differences between both fishing gears. Methods The assessment includes standard LCA impact categories, fishery-specific impact categories, and quantification of macroplastics and microplastics emitted to the environment. The functional unit selected was 1 kg of octopus and the study was a ‘cradle to gate’ system. The scope included fishing operations until the product is landed at the harbour. Primary data was obtained by face-to-face questionnaires from 22 vessels, with an average of 1005 pots and 1211 traps per vessel, and 372 pots and 234 traps lost annually to the environment. Plastic pots have a concrete block and traps are a metal framed covered by plastic netting. Each trap or pot is connected to the main line at regular intervals. Unlike traps, pots do not need bait. Results and discussion Fuel contribution to global warming is very high and where the highest potential exists to lower down the carbon footprint. The fuel use intensity resulted in 0.9 L/kg of octopus. The bait used in traps is significant and raises further environmental costs related with fuel consumption. The use of traps represents more than two times the impacts found for pots in all the categories studied except ecotoxicity categories. Zinc use was the main contributor to ecotoxicity categories, but it has not been included in other fishery LCA studies. It was estimated that 12.2 g of plastics is lost to the environment per kg of octopus. The loss of macroplastics from fishing gears was the highest contributor. Conclusions The carbon footprint obtained was 3.1 kg CO2 eq per kg of octopus, being lower compared to other seafood products, and less than half compared to octopus caught with trawling. Pots and traps are highly selective fishing gears, causing negligible disturbance to the seafloor. The stock is not assessed, but management measures exist and can be improved. A drawback exists related with gears lost to the environment.

The consumption of most metals continues to rise following ever-increasing population growth, affluence and technological development. Sustainability considerations urge greater resource efficiency and retention of metals in the economy. We model the fate of a yearly cohort of 61 extracted metals over time and identify where losses are expected to occur through a life-cycle lens. We find that ferrous metals have the longest lifetimes, with 150 years on average, followed by precious, non-ferrous and specialty metals with 61, 50 and 12 years on average, respectively. Production losses are the largest for 15 of the studied metals whereas use losses are the largest for barium, mercury and strontium. Losses to waste management and recycling are the largest for 43 metals, suggesting the need to improve design for better sorting and recycling and to ensure longer-lasting products, in combination with improving waste-management practices. Compared with the United Nations Environmental Programme’s recycling statistics, our results show the importance of taking a life-cycle perspective to estimate losses of metals to develop effective circular economy strategies. We provide the dataset and model used in a machine-readable format to allow further research on metal cycles ADEME BRGM

Important advances have been made to define the multiple impact pathways relating mineral resource use to the area of protection (AoP) natural resources in life cycle assessment (LCA). Yet, the link between stakeholders’ interests and the aspects relevant to resource use as addressed by existing impact assessment methods has so far only marginally been explored. This article proposes to go beyond the case-specific determination of stake­ holders’ interests (and the associated selection of impact assessment method) by defining multiple groups of different values based on cultural perspectives, in order to determine the corresponding relevant impact path­ ways and assessment methods. Relying on the Cultural Theory and related potential development scenarios, we identify socio-economicobjectives and resource management strategies that fit the egalitarian, individualist and hierarchist perspec­ tives. Our analysis reveals that different aspects of resource use may be most relevant to assess for each perspective since they pursue different socio-economic objectives. Egalitarians are expected to prioritize the long-term availability of geological stocks for future generations by keeping extraction flows to a minimum to reach global sufficiency, and individualists, to safeguard their short-term accessibility to resources by managing their supply risk. Hierarchists are likely to aim to maximize the value obtained from resources globally, and could thus focus on addressing dissipative flows. Building on this analysis, we provide a proposal for a more holistic assessment of the impact pathways linked to mineral resource use using existing LCIA methods, and identify ways forward for method developments to come. French agency for ecological transition (ADEME) French geological survey (BRGM)

Purpose The accessibility to most metals is crucial to modern societies. In order to move towards more sustainable use of metals, it is relevant to reduce losses along their anthropogenic cycle. To this end, quantifying dissipative flows of mineral resources and assessing their impacts in life cycle assessment (LCA) has been a challenge brought up by various stakeholders in the LCA community. We address this challenge with the extension of previously developed impact assessment methods and evaluating how these updated methods compare to widely used impact assessment methods for mineral resource use. Methods Building on previous works, we extend the coverage of the average dissipation rate (ADR) and lost potential service time (LPST) methods to 61 metals. Midpoint characterization factors are computed using dynamic material flow analysis results, and endpoint characterization factors, by applying the market price of metals as a proxy for their value. We apply these methods to metal resource flows from 6000 market data sets along with the abiotic depletion potential and ReCiPe 2016 methods to anticipate how the assessment of dissipation using the newly developed methods might compare to the latter two widely used ones. Results and discussion The updated midpoint methods enable distinguishing between 61 metals based on their global dissipation patterns once they have been extracted from the ground. The endpoint methods further allow differentiating between the value of metals based on their annual average market prices. Metals with a high price that dissipate quickly have the highest endpoint characterization factors. The application study shows that metals with the largest resource flows are expected to have the most impacts with the midpoint ADR and LPST methods, metals that are relatively more expensive have a greater relative contribution to the endpoint assessment. Conclusion The extended ADR and LPST methods provide new information on the global dissipation patterns of 61 metals and on the associated potentially lost value for humans. The methods are readily applicable to resource flows in current life cycle inventories. This new information may be complementary to that provided by other impact assessment methods addressing different impact pathways when used in LCA studies. Additional research is needed to improve the characterization of the value of metals for society and to extend the methods to more resources.

Modelling the use or the supply of recycled materials in a product-oriented Life Cycle Assessment (LCA) is challenging and a step in LCA that is typically associated with diverging practices and outcomes. In the ambition to harmonize LCA practices and increase the comparability of studies, the European Commission published the Product Environmental Footprint Guide, with the Circular Footprint Formula to model recycling. The formula considers the market situation of recycled materials, which is consistent with a consequential LCA perspective. Therefore, this paper evaluates the extent to which the Circular Footprint Formula follows a consequential LCA approach. To evaluate this, the considered consequential approach is first systematized in the form of a Causal Loop Diagram that shows the relevant parameters and their relationships. From the diagram, a formula is extracted in the same style of the Circular Footprint Formula, enabling comparison. It is concluded that the Circular Footprint Formula has the potential to, but at the moment does not, provide a full consequential approach. Main discrepancies between the Circular Footprint Formula and consequential LCA are 1) the lack of including the marginal suppliers and marginal users of materials instead of average or specific suppliers and users in the life cycle under study, 2) predetermined limitations of the extent to which substitutions can be modeled, and 3) an incomplete modelling of the effects of recycling when demand is constrained. A few inconsistencies were identified that merit to be corrected in an updated version of the Circular Footprint Formula. It is acknowledged that the Circular Footprint Formula does not claim to be consequential. However, alignment of the method with a clear LCA objective – such as a reduction of environmental impacts – could enable the production of LCA results that better inform decisions of companies, consumers, and policymakers.

The space sector is a new area of development for Life Cycle Assessment (LCA) studies. However, it deals with strong particularities which complicate the use of LCA. One of the most important is that the space industry is the only human activity crossing all stages of the atmosphere during the launch event or the atmospheric re-entry. As a result, interactions occur not only with the natural environment but also with the orbital environment during the use phase and the end-of-life of space missions. In this context, there is a lack of indicators and methods to characterise the complete life-cycle of space systems including their impact on the orbital environment. The end-of-life of spacecraft is of particular concern: space debris proliferation is today a concrete threat for all space activities. Therefore, the proposed work aims at characterising the orbital environment in term of space debris crossing the orbital resource. A complete methodology and a set of characterisation factors at midpoint level are provided. They are based on two factors: (i) the exposure to space debris in a given orbit and (ii) the severity of a potential spacecraft break-up leading to the release of new debris in the orbital environment. Then, we demonstrate the feasibility of such approach through three theoretical post-mission disposal scenarios based on the Sentinel-1A mission parameters. The results are discussed against the propellant consumption needed in each case with the purpose of addressing potential 'burden shifting' that could occur between the Earth environment and the orbital one.

Plastic debris into the environment is a growing threat for the ecosystems and human health. The seafood sector is particularly concerned because it generates plastic losses and can be endangered by plastic contamination. Life cycle assessment (LCA) does not properly consider plastic losses and related impacts, which is a problem in order to find relevant mitigation strategies without burden shifting. This work proposes a methodology for quantifying flows of plastics from the life cycle of the seafood products to the environment. It is based on loss rate and final release rate considering a pre-fate approach as proposed by the Plastic Leak Project. They are defined for 5 types of micro and macro plastic losses: lost fishing gears, marine coatings, plastic pellets, tire abrasion and plastic mismanaged at the end-of-life. The methodology is validated with a case study applied to French fish products for which relevant data are available in the Agribalyse 3.0 database. Results show that average plastic losses are from 75 mg to 4345 mg per kg of fish at the consumer, depending on the species and the related fishing method. The main plastic losses come from lost fishing gears (macroplastics) and tire abrasion (microplastics). Results show high variability: when mismanaged, plastic packaging at the end-of-life (macroplastics) is the main loss to the environment. As a next step the methodology is to be applied to other fish or shellfish products, or directly implemented in a life cycle inventory database. Further research should characterize the related impacts to the environment when life cycle impact assessment methodologies will be available, and identify eco-design solutions to decrease the major flows to the environment identified.

The dissipation of metals leads to potential environmental impacts, usually evaluated for product systems with life cycle assessment. Dissipative flows of metals become inaccessible for future users, going against the common goal of a more circular economy. Therefore, they should be addressed in life cycle impact assessment (LCIA) in the area of protection “Natural Resources.” However, life cycle inventory databases provide limited information on dissipation as they only track emissions to the environment as elementary flows. Therefore, we propose two LCIA methods capturing the expected dissipation patterns of metals after extraction, based on dynamic material flow analysis data. The methods are applied to resource elementary flows in life cycle inventories. The lost potential service time method provides precautionary indications on the lost service due to dissipation over different time horizons. The average dissipation rate method distinguishes between the conservation potentials of different metals. Metals that are relatively well conserved, including major metals such as iron and aluminum, have low characterization factors (CFs). Those with poor process yields, including many companion and high-tech metals such as gallium and tellurium, have high CFs. A comparative study between the developed CFs, along with those of the Abiotic Depletion Potential and Environmental Dissipation Potential methods, show that dissipation trends do not consistently match those of the depletion and environmental dissipation potentials. The proposed methods may thus be complementary to other methods when assessing the impacts of resource use on the area of protection Natural Resources when pursuing an increased material circularity. The research of Alexandre Charpentier Poncelet, PhD candidate, is co-financed by the French Agency for ecological transition (ADEME) and the French geological survey (BRGM)

Life cycle assessment (LCA) has been widely applied in many different sectors, but the marine products and seafood segment have received relatively little attention in the past. In recent decades, global fish production experienced sustained growth and peaked at about 179 million tonnes in 2018. Consequently, increased interest in the environmental implications of fishery products along the supply chain, namely from capture to end of life, was recently experienced by society, industry and policy-makers. This timely review aims to describe the current framework of LCA and its application to the seafood sector that mainly focused on fish extraction and processing, but it also encompassed the remaining stages. An excess of 60 studies conducted over the last decade, along with some additional publications, were comprehensively reviewed; these focused on the main LCA methodological choices, including but not limited to, functional unit, system boundaries allocation methods and environmental indicators. The review identifies key recommendations on the progression of LCA for this increasingly important sustaining seafood sector. Specifically, these recommendations include (i) the need for specific indicators for fish-related activities, (ii) the target species and their geographical origin, (iii) knowledge and technology transfer and, (iv) the application and implementation of key recommendations from LCA research that will improve the accuracy of LCA models in this sector. Furthermore, the review comprises a section addressing previous and current challenges of the seafood sector. Wastewater treatment, ghost fishing or climate change, are also the objects of discussion together with advocating support for the water-energy-food nexus as a valuable tool to minimize environmental negativities and to frame successful synergies. This work was supported by the EAPA_576/2018 NEPTUNUS project. The authors would like to acknowledge the financial support of Interreg Atlantic Area. Ana Cláudia Dias and Paula Quinteiro acknowledge FCT/MCTES for the financial support to CESAM (UIDB/50017/2020+UIDP/50017/2020), through national funds, and to the research contracts CEECIND/02174/2017 and CEECIND/00143/2017, respectively. peer-reviewed 2022-12-14

To meet the ever-growing need for performance in silicon devices, SoC providers have been increasingly relying on software-hardware cooperation. By controlling hardware resources such as power or clock management from the software, developers earn the possibility to build more flexible and power efficient applications. Despite the benefits, these hardware components are now exposed to software code and can potentially be misused as open-doors to new kind of attacks. In this work, we introduce SideLine, a novel side-channel vector based on delay-line components widely implemented in high-end SoCs. We demonstrate that these entities can be used to perform remote power side-channel attacks and we detail several attack scenarios in which an adversary process located in one processor core aims at eavesdropping the activity of a victim process located in another core. For each scenario, we demonstrate the adversary ability to fully recover the secret key of an AES algorithm running in the victim core. Even more detrimental, we show that these attacks are still practicable when a rich operating system is used.

To meet the ever-growing need for performance in silicon devices, SoC providers have been increasingly relying on software-hardware cooperation. By controlling hardware resources such as power or clock management from the software, developers earn the possibility to build more flexible and power efficient applications. Despite the benefits, these hardware components are now exposed to software code and can potentially be misused as open-doors to jeopardize trusted environments, perform privilege escalation or steal cryptographic secrets. In this work, we introduce SideLine, a novel side-channel vector based on delay-line components widely implemented in high-end SoCs. After providing a detailed method on how to access and convert delay-line data into power consumption information, we demonstrate that these entities can be used to perform remote power side-channel attacks. We report experiments carried out on two SoCs from distinct vendors and we recount several core-vs-core attack scenarios in which an adversary process located in one processor core aims at eavesdropping the activity of a victim process located in another core. For each scenario, we demonstrate the adversary ability to fully recover the secret key of an OpenSSL AES running in the victim core. Even more detrimental, we show that these attacks are still practicable if the victim or the attacker program runs over an operating system.

The selection of an appropriate allocation procedure for co-production and recycling in Life Cycle Assessment (LCA) depends on the goal and scope of the analysis. However, it is not always clear when partitioning or system expansion can be applied, or when to conduct an attributional or a consequential LCA, both for LCA practitioners and users of LCA results. In this paper, the influence of the goal and scope on the selected modeling approaches is clarified. The distinction between process-oriented and product-oriented LCAs, between system expansion and substitution, and between the cut-off approach and other allocation procedures are highlighted. Archetypes of goal and scope definitions are developed. These archetypes reflect the minimum amount of information required to select an allocation procedure. It is demonstrated via an illustrative example that the question &ldquo, what is the environmental impact of a product&rdquo, can result in at least 15 different research questions requiring at least five different modeling methods. Finally, perspectives are provided on the use of attributional and consequential approaches to evaluate the environmental, social, and economic sustainability of products and processes.

The space industry generates pressures on the environment and strives towards more sustainable activities. Several actors of or related to the European space industry, such as ArianeGroup or and the European Space Agency (ESA), have identified the life cycle assessment methodology (LCA) as the most appropriate methodology to measure and then support the reduction of their environmental impact. While the use of the LCA is being established within the sector, only a limited number of peer-reviewed publications are available. Most of the documents released by the stakeholders can be considered to be grey literature. As the topic has not been properly discussed in the literature, there is an opportunity to bring the initiatives carried out by the space sector in recent years to the public domain. Thus, the present work aims to provide a comprehensive overview of past and present studies following the LCA framework. The review compiles 11 papers, conferences proceedings or technical reports that address the development of the LCA framework and good practices in the sector and 27 documents dedicated to LCA studies. On the one hand, the results highlight the emergence of a common framework regarding LCA practice in Europe. On the other hand, the analysed LCA case studies show a highly heterogeneous goal and scope definition. In this review, research needs and methodological challenges are identified and discussed. Finally, recommendations on how to implement and develop the use of LCA within the space industry are given in view of designing more sustainable space systems and associated missions.

The built environment is recognized as a major hotspot of resource use and environmental impacts. Life Cycle Assessment (LCA) has been increasingly used to assess the environmental impacts of construction products and buildings and a new trend is characterized by the application of LCA to larger systems such as neighborhoods during early design phases. Assessing urban development projects at the master-planning stage raises the issue of inventory data collection, especially for building materials which are reported to account for about 20% of primary energy consumption in buildings, and up to 45% of associated greenhouse gas emissions. Urban planners focus on the urban morphology and little information is known about the buildings characteristics apart from their general shape. This paper proposes a simplified model for the assessment of buildings embodied energy and embodied carbon in relation with urban planners’ design levers. The model relies on the decomposition of buildings into functional elements in order to be sensitive to the shape of the buildings. A detailed sensitivity analysis and contribution analysis of the model is conducted on two types of generic building forms, in order to investigate the influence of parameters relating to shape on the embodied energy and embodied carbon of a building. The sensitivity analysis shows that the parameters relating to shape (such as the dimension of the buildings) are more influential on the embodied energy and embodied carbon per square meter of building than the ones relating to the elements themselves (such as the wall thickness). The contribution analysis also brings evidence of the relation between the compactness factor and the embodied energy and embodied carbon of a building.

The wine industry is facing two major environmental challenges: consumers are increasingly aware of the impacts of wine making, and production is jeopardized by environmental changes such as global warming. Therefore, there is a growing need to measure and minimize the environmental footprint of the sector. Life cycle assessment has already proven its worth in evaluating the environmental impacts and hotspots of bottled wine production. However, the methodological discrepancies in the LCA conducted do not allow conclusions regarding the most sustainable production systems or the most significant impacts for the sector. Moreover, LCA application in the field remains scarce due to the complexity of the method and the lack of readability of its results. In this study, 10 LCA papers corresponding to 17 different products were reviewed. Methodological discrepancies have been reduced through harmonization of the functional unit, the life cycle inventory and the life cycle impact assessment method, enabling provision of a range of results for different impact categories, as well as comparisons between different wines. The LCI elements that drive the results have been identified. This can be useful to simplify the data collection and the comparability of the products in this sector. Impact clusters (indicators that follow the same behaviour and are driven by the same LCI elements) have been proposed. Three clusters of impacts ((i) climate change, fossil depletion and particulate matter formation; (ii) terrestrial ecotoxicity; (iii) agricultural land occupation) are responsible for more than 90% of the single score. Nonetheless, the proposed harmonization procedure has limitations, and no conclusion can be made on the most sustainable products due to the remaining discrepancies in the system boundaries.

The European seafood and aquaculture sectors are facing important challenges in terms of environmental threats (climate change, marine debris, resources depletion), social development (worker rights, consumer's awareness) or economic growth (market and nonmarket goods and services, global competitiveness). These issues are forcing all stakeholders, from policy-makers to citizens and industries, to move to more sustainable policies, practices and processes. Consequently, an improvement in collaborations among different parties and beyond borders is required to create more efficient networks along the supply chain of seafood and aquaculture sectors. To achieve this, a â nexus thinkingâ approach (i.e. the analysis of actions in connected systems) combined with a life cycle thinking appears as an excellent opportunity to facilitate the transition to a circular economy. This work was supported by the EAPA_576/2018 NEPTUNUS project. The authors would like to acknowledge the financial support of Interreg Atlantic Area. A.C. Dias and P. Quinteiro acknowledge FCT/MCTES for the contracts CEECIND/02174/2017 and CEECIND/00143/2017, respectively, and for the financial support to CESAM (UID/AMB/50017/2019), through national funds. The Portuguese Foundation for Science and Technology (FCT) for supporting the contract of A. Marques in the framework of the IF2014 program (IF/00253/2014). peer-reviewed 2022-02-11

PurposeScientific Life Cycle Assessment (LCA) literature provides some examples of LCA teaching in higher education, but not a structured overview of LCA teaching contents and related competencies. Hence this paper aims at assessing and highlighting trends in LCA learning outcomes, teaching approaches and developed content used to equip graduates for their future professional practices in sustainability.MethodsBased on a literature review on teaching LCA in higher education and a collaborative consensus building approach through expert group panel discussions, an overview of LCA learning and competency levels with related teaching contents and corresponding workload is developed. The levels are built on the European Credit Transfer and Accumulation System (ECTS) and Bloom’s taxonomy of learning.Results and discussionThe paper frames five LCA learning and competency levels that differ in terms of study program integration, workload, cognitive domain categories, learning outcomes, and envisioned professional skills. It furthermore provides insights into teaching approaches and content, including software use, related to these levels.Conclusions and recommendationsThis paper encourages and supports higher educational bodies to implement a minimum of ‘life cycle literacy’ into students’ curriculum across various domains by increasing the availability, visibility and quality of their teaching on life cycle thinking and LCA.

International audience; Thanks to their performance and flexibility, FPGAs are increasingly adopted for hardware acceleration on various platforms such as system on chip and cloud datacenters. Their use for commercial and industrial purposes raises concern about potential hardware security threats. By getting access to the FPGA fabric, an attacker could implement malicious logic to perform remote hardware attacks. Recently, several papers demonstrated that FPGA can be used to eavesdrop or disturb the activity of resources located within and outside the chip. In a complex SoC that contains a processor and a FPGA within the same die, we experimentally demonstrate that FPGA-based voltage sensors can eavesdrop computations running on the CPU and that advanced side-channel attacks can be conducted remotely to retrieve the secret key of a symmetric crypto-algorithm.

International audience; The impact of non-energetic abiotic resource use in life cycle assessment (LCA) has been receiving much attention in the last decades, and even more so since the resource efficiency and circular economy have become prominent subjects of discussion in public and private sectors all around the world. As LCA has proven to be the most solid holistic tool to integrate environmental impacts in sustainability assessments of product systems, it should be able to integrate current concerns about non-energetic abiotic resource use into its methodology and therefore provide exploitable results for every LCA user. However, to this day no consensus has been reached on which approach for characterizing impacts due to the use of these resources should be used (Drielsma et al., 2016; Sonderegger et al., 2017). This seems to be attributable to the fact that no method is recognized as both solid on the methodological level while answering at the same time the true concerns for abiotic natural resource uses in LCA: the need to retain and therefore maximize their functional value in the technosphere after their extraction in order to fulfill the needs of current and future generations, while minimizing the losses to the ecosphere. Indeed, abiotic resources are not always consumed

International audience; FPGAs have been widely adopted in cloud datacenters and System-on-Chip for hardware acceleration purposes during the past few years. For flexibility and efficiency reasons, cloud FPGA fabrics are likely to be shared between multiple users. Despite the logical isolation suggested to protect each tenant, multiuser FPGA environment raises crucial questions about the potential security threats that it may represent. Recently, a series of papers demonstrated that a malicious user could be able to use its rented logic to perform remote side-channel and fault attacks on other user assets located inside the fabric or in the surrounding chips. In this paper, we present a novel implementation method for ring oscillator based voltage sensors that enables runtime supply voltage fluctuation measurement. Considering a multiuser FPGA cloud scenario, we evaluate our sensor performances for side-channel purposes by performing CPA attacks against a hardware AES module instantiated within the same FPGA fabric. Then, we compare our results with existing voltage sensors and also demonstrate that, when calibrated, our sensors can provide results similar to traditional electromagnetic side-channel setups.

International audience; Life cycle assessment (LCA) has proven its worth in modelling the entire value chain associated with the production of goods and services. However, modelling the consumption system, such as the use phase of a product, remains challenging due to uncertainties in the socioeconomic context. Agent-based models (ABMs) can reduce these uncertainties by improving the consumption system modelling in LCA. So far, no systematic study is available on how ABM can contribute towards a behaviour-driven modelling in LCA. This paper aims at filing this gap by reviewing all papers coupling both tools. A focus is carried out on 18 case studies which are analysed according to criteria derived from the four phases of LCA international standards. Criteria specific to agent-based models and the coupling of both tools, such as the type and degree of coupling, have also been selected. The results show that ABMs have been coupled to LCA in order to model foreground systems with too many uncertainties arising from a behaviour-driven use phase, local variabilities, emerging technologies, to explore scenarios and to support consequential modelling. Foreground inventory data have been mainly collected from ABM at the use phase. From this review, we identified the potential benefits from ABM at each LCA phase: (i) scenario exploration, (ii) foreground inventory data collection, (iii) temporal and/or spatial dynamics simulation, and (iv) data interpretation and communication. Besides, methodological guidance is provided on how to choose the type and degree of coupling during the goal and scope phase. Finally, challenging LCA areas of research that could benefit from the agent-based approach to include behaviour-driven dynamics at the inventory and impact assessment phase have been identified.

International audience; Global consumption of carbon fibers reinforced polymer (CFRP) is rising and the management of waste is an issue of high concern. In order to implement a sustainable carbon fiber recycling sector, there is a need to evaluate the potential environmental impacts of recycling processes.In this context, we compared current end-of-life scenarios (landfilling and incineration) with recycling technologies: pyrolysis, supercritical solvolysis and electrodynamic fragmentation using life cycle assessment. We conducted two analyses: a comparison between the CFRP end-of-life processes and a comparison including the substituted products from the recycled carbon fibers.When only considering the end-of-life processes, recycling processes have a higher environmental impact as they require higher energy demand than incineration or landfilling. When considering product substitution, recycling is environmentally beneficial since they replace the production of virgin products. Results are variable depending on the technology readiness level and the quality of fibers recovered from the recycling processes.

Multifunctionality in life-cycle assessment (LCA) is solved with allocation, for which many different procedures are available. Lack of sufficient guidance and difficulties to identify the correct allocation approach cause a large number of combinations of methods to exist in scientific literature. This paper reviews allocation procedures for recycling situations, with the aim to identify a systematic approach to apply allocation. Assumptions and definitions for the most important terms related to multifunctionality and recycling in LCA are given. The most relevant allocation procedures are identified from literature. These procedures are expressed in mathematical formulas and schemes and arranged in a systematic framework based on the underlying objectives and assumptions of the procedures. If the LCA goal asks for an attributional approach, multifunctionality can be solved by applying system expansion—i.e. including the co-functions in the functional unit—or partitioning. The cut-off approach is a form of partitioning, attributing all the impacts to the functional unit. If the LCA goal asks for a consequential approach, substitution is applied, for which three methods are identified: the end-of-life recycling method and the waste mining method, which are combined in the 50/50 method. We propose to merge these methods in a new formula: the market price-based substitution method. The inclusion of economic values and maintaining a strict separation between attributional and consequential LCA are considered to increase realism and consistency of the LCA method. We identified the most pertinent allocation procedures—for recycling as well as co-production and energy recovery—and expressed them in mathematical formulas and schemes. Based on the underlying objectives of the allocation procedures, we positioned them in a systematic and consistent framework, relating the procedures to the LCA goal definition and an attributional or consequential approach. We identified a new substitution method that replaces the three existing methods in consequential LCA. Further research should test the validity of the systematic framework and the market price-based substitution method by means of case studies.

Multifunctionality in LCA can be solved by several allocation procedures. Various official guidelines give divergent recommendations in which allocation procedure to apply, and up to now, no consensus has been reached. We aim to identify the obstacles to a consistent allocation approach that can be applied to all product categories and is supported by a broad range of stakeholders. Based on a systematic framework for consistent allocation, developed by Schrijvers et al. (Int J Life Cycle Assess, 2016), we identify five review criteria that indicate the degree of consistency in the proposed allocation procedure of official guidelines. Several relevant guidelines, i.e. ISO 14044, ISO/TR 14049, ISO/TS 14067, the ILCD Handbook, BP X30-323-0, PAS 2050, the Greenhouse Gas Protocol, EN15804, PEF Guide and guidance documents for EPDs and PCRs, are reviewed according to these criteria. None of the investigated guidelines fully follows the systematic framework for allocation. Often, different approaches are recommended for co-products and recycled materials, although the boundary between these flows is not always clear. Many guidelines do not recognize the existence of different LCA goals; therefore, elements of attributional and consequential LCAs are often mixed. The market situation of the recycled material is not always taken into account, e.g. in the mandatory 50/50 method of the PEF Guide. The ILCD Handbook and the General Programme Instructions for the International EPD® System provide most consistent guidance. We argue that consistency does not require a one-formula-fits-all method, as this would favour some product categories and only responds to a certain LCA goal. A critical review of guidelines against a systematic framework for allocation of co-products and recycled materials shows that few guidelines propose a consistent allocation approach. The main obstacles for consistency are the different approaches for co-production and (different types of open-loop) recycling and disregarding of different LCA goals and recycled material markets. We recommend to include material specific guidance in Product Category Rules on the determination of market prices, quality determining factors and relevant material properties for different applications.

International audience; The emphasis on the sustainable urban water management has increased over the last decades. In this context decision makers need tools to measure and improve the environmental performance of urban water systems (UWS) and their related scenarios. In this paper, we propose a versatile model, named WaLA (Water system Life cycle Assessment), which reduces the complexity of the UWS while ensuring a good representation of water issues and fulfilling life cycle assessment (LCA) requirements. Indeed, LCAs require building UWS models, which can be tedious if several scenarios are to be compared. The WaLA model is based on a framework that uses a 'generic component' representing alternately water technology units and water users, with their associated water flows, and the associated impacts due to water deprivation, emissions, operation and infrastructure. UWS scenarios can be built by inter-operating and connecting the technologies and users components in a modular and integrated way. The model calculates life cycle impacts at a monthly temporal resolution for a set of services provided to users, as defined by the scenario. It also provides the ratio of impacts to amount of services provided and useful information for UWS diagnosis or comparison of different scenarios. The model is implemented in a Matlab/Simulink interface thanks to object-oriented programming. The applicability of the model is demonstrated using a virtual case study based on available life cycle inventory data.

Production of alkyl polyglycosides (APGs) from mechanocatalytic depolymerization of wheat straw is a promising route because of the use of an available bio-based feedstock. This study aims to verify the environmental benefit of this process in comparison with a reference process that produces APGs from corn starch based glucose. A life cycle assessment methodology is used to compare both production routes. The results have shown that the new production route based on wheat straw generates lower environmental impacts compared to the reference process because of the use of wheat straw instead of corn starch based glucose and the energy recovery from the by-product lignin that meets most of the energy demand of the process. The LCA results also show that the production of fatty alcohol dominates the life cycle impact of APGs. Environmental impacts are sensitive to the source of the fatty alcohol (from palm kernel or coconut oil).

International audience; A framework and an associated modeling tool to perform life cycle assessment (LCA) of urban water system, namely the WaLA model, has been recently developed. In this paper, the WaLA model is applied to a real case study: the urban water system of the Paris suburban area, in France. It aims to verify the capacity of the model to provide environmental insights to stakeholder's issues related to future trends influencing the system (e.g., evolution of water demand, increasing water scarcity) or policy responses (e.g., choices of water resources and technologies). This is achieved by evaluating a baseline scenario for 2012 and several forecasting scenarios for 2022 and 2050. The scenarios are designed through the modeling tool WaLA, which is implemented in Simulink/Matlab: it combines components representing the different technologies, users and resources of the UWS. The life cycle inventories of the technologies and users components include water quantity and quality changes, specific operation (electricity, chemicals) and infrastructures data (construction materials). The methods selected for the LCIA are midpoint ILCD, midpoint water deprivation impacts at the sub-river basin scale, and endpoint Impact 2002þ. The results of the baseline scenario show that wastewater treatment plants have the highest impacts compared to drinking water production and distribution, as traditionally encountered in LCA of UWS. The results of the forecasting scenarios show important changes in water deprivation impacts due to water management choices or effects of climate change. They also enable to identify tradeoffs with other impact categories and to compare several scenarios. It suggests the capacity of the model to deliver information for decision making about future policies.

International audience; In this paper, we present how SEMBA, a fast invasive technique for white team Hardware Trojan detection, has been used to differentiate between a maliciously infected integrated circuit and a genuine one. Our methodology is based on the observation of the component’s hardware structure and includes the use of wet etching, Scanning Electron Microscopy and Multiple Image Alignment. Once the Integrated Circuits’ image have been fully reconstructed, image processing allows to detect the presence of the Hardware Trojan (HT). SEMBA is a fully automated approach with a 100% success rate, detecting any ‘transistor-size’ HTs and requiring ‘affordable’ resources and time.

International audience; Nowadays, the security level of secure integrated circuits makes simple attacks less efficient. The combination of invasive approaches and fault attacks can be seen as more and more pertinent to retrieve secrets from integrated circuits. This article includes a practical methodology and its application. We first describe how to retrieve the physical areas of interest for the attack. Then, we perform a deep fault injection characterization of the area of found. For the former, a methodology based on circuit preparation, Scanning Electron Microscopy (SEM) acquisitions, image registration and processing is given allowing to perform a controlled and localized laser fault attack with a state of the art injection platform. The laser fault injection presented here allows the attacker to perform a "bit-set", a "bit-reset" or a full register "reset". Controlling the value stored in a flip-flop is critical for security. To illustrate this methodology, an encryption algorithm is targeted. We see that efficient method that takes advantage of the comparison between faulty and correct cipher texts, such as Differential Fault Analysis (DFA) or "Safe Error", are particularly relevant with the proposed methodology. The overall methodology can efficiently be used to speed up an attack and to improve the test coverage.

International audience; Water is a growing concern in cities, and its sustainable management is very complex. Life cycle assessment (LCA) has been increasingly used to assess the environmental impacts of water technologies during the last 20 years. This review aims at compiling all LCA papers related to water technologies, out of which 18 LCA studies deals with whole urban water systems (UWS). A focus is carried out on these 18 case studies which are analyzed ac- cording to criteria derived from the four phases of LCA international standards. The results show that whereas the case studies share a common goal, i.e., providing quantitative in- formation to policy makers on the environmental impacts of urban water systems and their forecasting scenarios, they are based on different scopes, resulting in the selection of different functional units and system boundaries. A quantitative comparison of life cycle inventory and life cycle impact assessment data is provided, and the results are discussed. It shows the superiority of information offered by multi-criteria approaches for decision making compared to that derived from mono-criterion. From this review, recommenda- tions on the way to conduct the environmental assessment of urban water systems are given, e.g., the need to provide consistent mass balances in terms of emissions and water flows. Remaining challenges for urban water system LCAs are identified, such as a better consideration of water users and resources and the inclusion of recent LCA developments (territorial approaches and water-related impacts).; L'eau est une préoccupation croissante dans les villes, et sa gestion durable est très complexe. L'analyse du cycle de vie (ACV) a été de plus en plus utilisé pour évaluer les impacts environnementaux des technologies de l'eau au cours des 20 dernières années. Cet examen vise à compiler tous les documents de l'ACV liés aux technologies de l'eau, dont 18 études ACV traite des systèmes d'eau urbains entiers (UWS). Une mise au point est effectuée sur ces 18 études de cas qui sont analysés selon des critères issus des quatre phases de normes internationales ACV. Les résultats montrent que, tandis que les études de cas partagent un objectif commun, à savoir, fourniture d'informations quantitatives pour les décideurs politiques sur les impacts environnementaux des systèmes d'eau urbains et leurs scénarios de prévision, ils sont basés sur des portées différentes, ce qui entraîne la sélection des différents fonctionnelle unités et les limites du système. Une comparaison quantitative de l'inventaire du cycle de vie et du cycle de vie des données d'évaluation d'impact est fourni, et les résultats sont discutés. Il montre la supériorité de l'information offerte par les approches multi-critères pour la prise de décision par rapport aux informations provenant de mono-critère. De cet examen, des recommandations sur la façon de procéder à l'évaluation environnementale des systèmes d'eau urbains sont donnés, par exemple, la nécessité de fournir des bilans de masse cohérentes en termes d'émissions et des flux d'eau. Défis à relever pour le système des eaux urbaines ACV sont identifiés, comme une meilleure prise en compte des utilisateurs et des ressources en eau et l'inclusion de l'évolution récente de l'ACV (approches territoriales et les impacts liés à l'eau).

International audience; Laser fault injections have been evolving rapidly with the advent of more precise, sophisticated and cost-efficient sources, optics and control circuits. In this paper, we show a methodology to improve the test coverage and to speed up analysis based on laser fault injections by only targeting standard cells of interest. We describe how to identify interesting spatial positions thanks to the use of some chemicals along with an automated Scanning Electron Microscope image acquisition, alignment and processing. Using the latter information, fault injections with a high success rate have been obtained against a hardware implemented AES module using a laser beam. With such tools and methodology, we show that attacks become much faster.

International audience; Environmental impact assessment models are readily available for the assessment of pollution-related impacts in life cycle assessment (LCA). These models have led to an increased focus on water pollution issues resulting in numerous LCA studies. Recently, there have been significant developments in methods assessing freshwater use. These improvements widen the scope for the assessment of wastewater treatment (WWT) technologies, now allowing us to apprehend, for the first time, a combination of operational (energy and chemicals use), qualitative (environmental pollution) and quantitative (water deprivation) issues in wastewater treatment. This enables us to address the following question: Is water consumption during wastewater treatment environmentally significant compared to other impacts? To answer this question, a standard life cycle inventory (LCI) was performed with a focus on consumptive water uses at plant level, where several WWT technologies were operating, in different climatic conditions. The impacts of water consumption were assessed by integrating regionalized characterization factors for water deprivation within an existing life cycle impact assessment (LCIA) method. Results at the midpoint level, show that water deprivation impacts are highly variable in relation to the chosen WWT technology (water volume used) and of WWTP location (local water scarcity). At the endpoint level, water deprivation impacts on ecosystem quality and on the resource damage categories are significant for WWT technologies with great water uses in water-scarce areas. Therefore, our study shows the consideration of water consumption-related impacts is essential and underlines the need for a greater understanding of the water consumption impacts caused by WWT systems. This knowledge will help water managers better mitigate local water deprivation impacts, especially in selecting WWT technologies suitable for arid and semi-arid areas.; Des modèles de caractérisation des impacts environnementaux sont déjà disponibles pour l'évaluation des impacts liés à la pollution en analyse de cycle de vie (ACV). Ces modèles ont permis de nombreuses études ACV sur les questions de pollution de l'eau. Récemment, il y a eu d'importantes avancées méthodologiques sur la prise en compte de l'eau douce. Ces nouveautés élargissent le champ d'évaluation des technologies de traitement d'eaux usées, ce qui nous permet pour la première fois, une combinaison d'aspects opérationnels (énergie et réactifs chimiques), qualitatifs (pollution environnementale) et quantitatifs (carence en eau). Il est donc possible de répondre à la question suivante : Est-ce que la consommation d'eau dans un système d'assainissement est significative pour l'environnement vis-à-vis des autres impacts générés ? Pour répondre à cette question, un inventaire de cycle de vie standard a été réalisé avec une attention particulière sur les consommations d'eau dans le périmètre de la station de traitement d'eaux usées (STEU), pour différentes filières de traitement et pour différentes conditions climatiques. Les impacts de la consommation d'eau ont été analysés en intégrant des facteurs de caractérisation régionalisés pour la carence en eau dans une méthode existante d'analyse de cycle de vie. Les résultats obtenus au niveau des indicateurs d'impact midpoint montrent que les impacts dus à la carence en eau varient fortement en fonction de la filière de traitement choisie (volume d'eau consommé) et de la localisation géographique de la STEU (rareté de l'eau au niveau local). Au niveau des indicateurs d'impact endpoint, les impacts dus à la carence en eau sur les catégories de dommages à la qualité des écosystèmes et aux ressources sont significatifs pour les filières de traitement ayant d'importantes consommations d'eau dans les régions arides. Ainsi, notre étude montre qu'il est important de considérer les impacts liés à la consommation d'eau et souligne le besoin d'une meilleure compréhension de ces impacts causés par les systèmes d'assainissement. Ces connaissances vont aider à prendre des décisions informées pour mieux faire face aux impacts locaux de la rareté en eau, notamment sur le choix des filières de traitement adaptées aux régions arides et semi-arides.

International audience; Hardware characterizations of integrated circuits have been evolving rapidly with the advent of more precise, sophisticated and cost efficient tools. In this paper we describe how the fine tuning of a laser source has been used to characterize, set and reset the state of registers in a 90nm chip. By adjusting the incident laser beam's location, it is possible to choose to switch any register value from '0' to '1' or vice-versa by targeting the PMOS side or the NMOS side. Plus, we show how to clear a register by selecting a laser beam's power. With the help of imaging techniques, we are able to explain the underlying phenomenon and provide a direct link between the laser mapping and the physical gate structure. Thus, we correlate the localization of laser fault injections with implementations of the PMOS and NMOS areas in the silicon substrate. This illustrates to what extent laser beams can be used to monitor the bits stored within registers, with adverse consequences in terms of security evaluation of integrated circuits.

Physical water deprivation at the midpoint level is assessed in water-related LCIA methods using water scarcity indicators (e.g., withdrawal-to-availability and consumption-to-availability) at the river basin scale. Although these indicators represent a great step forward in the assessment of water-use-related impacts in LCA, significant challenges still remain in improving their accuracy and relevance. This paper presents a methodology that can be used to derive midpoint characterization factors for water deprivation taking into account downstream cascade effects within a single river basin. This effect is considered at a finer scale because a river basin must be split into different subunits. The proposed framework is based on a two-step approach. First, water scarcity is defined at the sub-river basin scale with the consumption-to-availability (CTA) ratio, and second, characterization factors for water deprivation (CFWD) are calculated, integrating the effects on downstream sub-river basins. The sub-river basin CTA and CFWD were computed based on runoff data, water consumption data and a water balance for two different river basins. The results show significant differences between the CFWD in a given river basin, depending on the upstream or downstream position. Finally, an illustrative example is presented, in which different land planning scenarios, taking into account additional water consumption in a city, are assessed. Our work demonstrates how crucial it is to localize the withdrawal and release positions. within a river basin.

International audience; Today's trend in the smart card industry is to move from ROM+EEPROM chips to Flash-only products. Recent publications have illustrated the vulnerability of Floating Gate memories to UV and heat radiation. In this paper, we explain how, by using low cost means, such a vulnerability can be used to modify specific data within an EEPROM memory even in the presence of a given type of counter-measure. Using simple means, we devise a fault injection tool that consistently causes predictable modifications of the targeted memories' contents by flipping `1's to `0's. By mastering the location of those modifications, we illustrate how we can reverse-engineer a simple address scrambling mechanism in a white box analysis of a given EEPROM. Such an approach can be used to test the security of Floating Gate memories used in security devices like smart cards. We also explain how to prevent such attacks and we propose some counter-measures that can be either implemented on the hardware level by chip designers or on the software level in the Operating System interacting with those memories.

In this thesis we evaluate software-based hardware attacks, a novel attack family that targets connected devices such as IoT products, smartphones or cloud datacenters. These attacks take advantage of hardware resources that can be directly accessed from software in complex integrated circuits and use them to conduct fault injection and side-channel analysis exploits. Because they are triggered by software code, they can be launched remotely and on multiple victim devices regardless of their physical location. Through the evaluation of software-based hardware attacks we aim at assessing the level of threat they pose to connected devices security. The challenge is considerable since any connected device is potentially endangered.Through our experiments, we discovered generic attack vectors widely implemented in recent SoCs that could enable remote hardware attacks. We conducted FPGA-to-FPGA and FPGA-to-CPU attacks and demonstrated that remote power analysis was feasible. These new attack paths represent a serious threat for FPGA-based systems especially when applied to cloud FPGAs and heterogeneous SoCs. Then, we went further by proving that delay-line components, widely implemented in high-end SoCs, could be used for conducting fault injection and side-channel attacks. We built various scenarios such as CPU-to-MCU attacks on complex operating systems and demonstrated that software-based hardware attacks could successfully break the logical isolation between processes and lead to the extraction of sensitive information. Our research works describe the methodology adopted to build and conduct the attacks along with countermeasure proposals to mitigate their impact.; Cette thèse propose d’étudier ces nouveaux chemins d’attaque qui exploitent des vulnérabilités physiques à distance. Plus précisément elle s’intéresse à celles qui utilisent du logiciel comme vecteur d’attaque matérielle. Il peut s’agir par exemple d’un programme malveillant envoyé à des dizaines, voire des milliers d’appareils connectés. Une fois actif, il identifie des ressources matérielles présentes dans les systèmes ciblés (capteurs, régulateurs) et les détourne de leur rôle initial afin de mener des attaques matérielles. À l’instar d’attaques reconnues telles que Rowhammer, CLKSCREW ou Platypus, les travaux réalisés durant ces trois années de recherche contribuent à mettre en avant le danger potentiel des attaques matérielles à distance. Cette thèse contient des résultats variés allant de l’analyse de consommation sur FPGA à de l’injection de faute sur processeurs complexes. Elle décrit la menace potentielle des attaques matérielles à distance, notamment au regard de l’adoption d’entités de sécurité intégrées dans les processeurs complexes et de l’accroissement des services connectés en général (IoT, Cloud). Toutes ces études ont été menées de façon à être reproductibles et réalisables à distance. Elles visent à préparer les différents acteurs de la sécurisation des objets connectés à cette menace naissante et ainsi éviter sa mise en exécution future sur des milliers d’appareils à travers le monde.

The management of organisational performance at both activity and product level is a key issue for companies. However, while costing and performance monitoring are crucial for managers, the integration of environmental impact indicators into business management tools is still marginal. By focusing on the specific sector of wine production, this doctoral research aims to answer the following question: "Is it possible to integrate Life Cycle Assessment (LCA) into a cost accounting system in an automated and systematised manner? ». The core of the thesis is the development of a method enabling the integration of LCA with the ABC (Activity-Based Costing) accounting method. This method, called ABC-ACV, is based on the ABC calculation structure. It simultaneously provides information on the costs and environmental impacts of an organisation's activities and products. This requires the construction of environmental cost accounting, which groups together the costs and environmental impacts associated with the different accounts. The methodological proposal is then tested on two wine-producing properties, one in the Beaujolais region and the other in the Gironde region, making it possible both to validate its applicability and to assess the relevance of the information provided to the organisations' managers. LCA results are obtained by applying a hybrid approach coupling LCA process and Input-Output approach. The originality and interest of the method lie in the evaluation of costs and impacts per activity and the possibility of obtaining costs and impacts for all the organisation's products from the same distribution model. Finally, the process of creating a tool to automate the calculations and the deployment of the method to wine properties is described. This calculation module, called Sustaincost, is developed by Ertus Group as an extension of a commercially available solution called Process2wine. The information entered in Process2wine is to be used for the implementation of the ABC-ACV. A series of useful management indicators follows, which can be used for continuous improvement or external communication purposes., La gestion des performances organisationnelles tant au niveau des activités que des produits est un enjeu primordial pour les entreprises. Cependant, si le calcul des coûts et le suivi de la performance sont cruciaux pour les dirigeants, l’intégration d’indicateurs d’impacts environnementaux dans les outils de gestion des entreprises reste encore marginale. En se focalisant sur le secteur spécifique des activités viti-vinicoles, cette recherche doctorale a pour ambition de répondre à la question suivante : « Est-il possible d'intégrer l'ACV dans un système de comptabilité analytique, de manière automatisée et systématisée ? ». Le cœur de la thèse est le développement d’une méthode permettant l’intégration de l’ACV avec la méthode de comptabilité par activité ABC (Activity-Based Costing). Cette méthode, appelée ABC-ACV, s’appuie sur la structure calculatoire de l’ABC. Elle permet simultanément d’obtenir des informations relatives aux coûts et aux impacts environnementaux des activités et des produits d’une organisation. Cela nécessite la construction d’une comptabilité analytique environnementale, qui regroupe les coûts et les impacts environnementaux associés aux différents comptes. La proposition méthodologique est ensuite testée sur deux propriétés viti-vinicoles, l’une dans le Beaujolais et l’autre en Gironde, permettant à la fois de valider son applicabilité et mais aussi d’évaluer la pertinence des informations fournies aux gestionnaires des organisations. Les résultats d’ACV sont obtenus en appliquant une approche hybride couplant ACV processus et approche Entrées-Sorties. L’originalité et l’intérêt de la méthode tiennent dans l’évaluation des coûts et des impacts par activité et la possibilité d’obtenir les coûts et les impacts pour l’ensemble des produits de l’organisation à partir d’un même modèle de répartition. Enfin, le processus de création d’un outil permettant l’automatisation des calculs et le déploiement de la méthode auprès des propriétés viti-vinicole est décrit. Ce module de calcul, appelé Sustaincost, est développé par Ertus Group, en tant qu’extension d’une solution commercialisée dénommée Process2wine. Les informations saisies au sein de Process2wine doivent servir à la mise en place de l’ABC-ACV. Il s’en suit une série d’indicateurs de gestion utiles, pouvant servir à des fins d’amélioration continue ou de communication externe.