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133 results on '"Chiaraluce F."'

5. Security analysis of a blockchain-based protocol for the certification of academic credentials

Author

Baldi, M., Chiaraluce, F., Kodra, M., and Luca SPALAZZI

Subjects
FOS: Computer and information sciences, Computer Science - Cryptography and Security, Cryptography and Security (cs.CR)
Abstract

We consider a blockchain-based protocol for the certification of academic credentials named Blockcerts, which is currently used worldwide for validating digital certificates of competence compliant with the Open Badges standard. We study the certification steps that are performed by the Blockcerts protocol to validate a certificate, and find that they are vulnerable to a certain type of impersonation attacks. More in detail, authentication of the issuing institution is performed by retrieving an unauthenticated issuer profile online, and comparing some data reported there with those included in the issued certificate. We show that, by fabricating a fake issuer profile and generating a suitably altered certificate, an attacker is able to impersonate a legitimate issuer and can produce certificates that cannot be distinguished from originals by the Blockcerts validation procedure. We also propose some possible countermeasures against an attack of this type, which require the use of a classic public key infrastructure or a decentralized identity system integrated with the Blockcerts protocol., 12 pages, 14 figures

Published
2019

6. The future of Cybersecurity in Italy: Strategic focus area

Author

Baldoni, R., De Nicola, R., Prinetto, P., Anglano, C., Aniello, L., Antinori, A., Armando, A., Aversa, R., Baldi, Marco, Barili, A., Bartoletti, M., Bellini, M., Bergadano, F., Bernardeschi, C., Bianchi, E., Biancotti, C., Bistarelli, S., Blefari Melazzi, N., Boetti, M., Bondavalli, A., Bonomi, ., Buccafurri, F., Cambiaso, E., Caputo, B., Carminati, B., Cataliotti, F. S., Catarci, T., Ceccarelli, A., Cesa Bianchi, N., Chiaraluce, F., Colajanni, M., Conti, M., Coppolino, L., Costa, G., Costamagna, V., Cotroneo, D., Crispo, B., Cucchiara, R., D’Antonio, S., Damiani, E., De Santis, A., Di Battista, G., Di Martino, B., Degiovanni, I. P., Demetrescu, C., Di Corinto, A., Di Luna, A., Di Natale, G., Dini, G., Evangelisti, M., Falcinelli, D., Figà, G., Ferretti, M., Ficco, M., Flocchini, P., Flottes, M., Focardi, R., Furfaro, Franchina., Girdinio, P., Guida, F., Italiano, G. F., Lain, D., Laurenti, N., Lioy, A., Loreti, M., Malerba, D., Mancini, L. V., Marchetti Spaccamela, A., Marcialis, G., Margheri, A., Marrella, A., Martinelli, F., Martinelli, M., Martino, L., Massacci, F., Mayer, M., Mecella, M., Mensi, M., Merlo, A., Miculan, M., Montanari, L., Morana, M., Mosco, G. D., Mostarda, L., Murino, V., Nardi, D., Navigli, R., Palazzi, A., Palmieri, F., Panetta, I. C., Passarella, A., Pellegrini, A., Pelosi, G., Pellegrino, G., Pirlo, G., Piuri, V., Pizzonia, M., Pogliani, M., Polino, M., Pontil, M., Quaglia, F., Quattrociocchi, W., Querzoni, L., Rak, M., Ranise, S., Ricci, E., Rossi, L., Rota, P., Russo, L. O., Samarati, P., Santoro, N., Santucci, B., Sassone, V., Scala, A., Scotti, F., Servida, A., Spagnoletti, P., Spalazzi, L., Spidalieri, F., Spoto, A., Squarcina, M., Stefanelli, S., Vecchio, A., Venticinque, S., Villoresi, P., Visaggio, A., Vitaletti, A., and Zanero, S.

Subjects
Cyber security
Published
2018

7. NEXTRACK - Next Generation ESTRACK Uplink Services

Author

Abello, R., primary, Prata, R., additional, Santos Ugarte, L., additional, Simone, L., additional, Baldi, M., additional, Chiaraluce, F., additional, Fernandes, R., additional, da Silva, P. Freire, additional, Garello, R., additional, Gelfusa, D., additional, Palomo, J. M., additional, and Paolini, E., additional

Published
2019
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8. A Study on State-of-the-Art Space Mission Telecommand Receivers

Author

Baldi, M., Bertinelli, M., Chiaraluce, F., Closas, Pau, Dhakal, P., Garello, R., Maturo, N., Navarro, Mònica, Palomo, J.M., Paolini, E., Pfletschinger, Stephan, Silva, P.F., Simone, L., and Vilà-Valls, Jordi

Abstract

This paper is the result of a study promoted by the European Space Agency, aimed at research, design, development, and demonstration of a state-of-the-art receiver chain for telecommand (TC) links in space missions. The introduction of new, very powerful low-density parity-check codes for error correction, recently approved for the TC standard, allows to operate at significantly lower signal-to-noise ratios. This implies a number of challenges for the receivers in terms of frame synchronization, carrier acquisition, and tracking loops. Both the decoding and the receiver algorithms must be optimized as well, in view of permitting efficient hardware and software implementation, while ensuring excellent error rate performances. All these issues are faced in the present study through a fruitful co-operation between industry, research centers and universities. This paper presents a survey of the main results achieved, covering receiver enhancement investigation, simulation, implementation and breadboard description, © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Published
2017
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9. State-of-the-art space mission telecommand receivers

Author

Baldi, M., primary, Bertinelli, M., additional, Chiaraluce, F., additional, Closas, P., additional, Dhakal, P., additional, Garello, R., additional, Maturo, N., additional, Navarro, M., additional, Palomo, J. M., additional, Paolini, E., additional, Pfletschinger, S., additional, Silva, P. F., additional, Simone, L., additional, and Vilà-Valls, J., additional

Published
2017
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10. Reduction of Walsh-Transformed Electrocardiograms by Double Logarithmic Coding

Author

Berti, E., Chiaraluce, F., Evans, N. E., and McKee, J.J.

Subjects
Cardiology, Experimental -- Evaluation, Electrocardiogram -- Evaluation, Data compression, Biological sciences, Business, Computers, Health care industry
Abstract

This work presents an electrocardiogramECG data reduction method based on Walsh spectrum double logarithmic quantization. The technique is theoretically justified for a simulated ECG and its practical efficiency confirmed using MIT/BIH arrhythmia database signals. By classifying a 'good' compression as one with MSE [is less than or equal to] 0.005 for 1: I spectral reduction, a normal/abnormal ECG mix returned an 87% success rate for waveforms stored with 8- to 11-bit resolution. Index Terms--Cardiology, ECG data compression, nonuniform quantization, Walsh functions.

Published
2000

11. A variant of the McEliece cryptosystem with increased public key security

Author

Baldi, M, Bianchi, M, Chiaraluce, F, Rosenthal, J, Schipani, D, Università Politecnica delle Marche [Ancona] (UNIVPM), Allergy Unit - Department of Dermatology, Universität Zürich [Zürich] = University of Zurich (UZH), University of Zurich, Augot, D, and Canteaut, A

Subjects
public key security, 10123 Institute of Mathematics, [INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], 510 Mathematics, ACM: E.: Data/E.3: DATA ENCRYPTION, error-correcting codes, ACM: G.: Mathematics of Computing/G.2: DISCRETE MATHEMATICS, [INFO.INFO-IT]Computer Science [cs]/Information Theory [cs.IT], ACM: E.: Data/E.4: CODING AND INFORMATION THEORY, [MATH.MATH-IT]Mathematics [math]/Information Theory [math.IT], [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], McEliece cryptosystem
Abstract

International audience; We propose a new variant of the McEliece cryptosystem which ensures that the code used as the public key is not permutation-equivalent to the secret code. This allows to increase the security of the public key, and to reconsider possible adoption of classical families of codes, like Reed-Solomon codes. A reduction in the key size or, equivalently, an increased level of security against nformation set decoding are the main advantages of the modi ed cryptosystem. As a drawback, the domain of intentional error vectors must be restricted, but we show that this has no signi cant impact on the security level.

Published
2011

13. NEXCODE: Next generation uplink coding techniques.

Author

Baldi, M., Bertinelli, M., Chiaraluce, F., Closas, P., Garello, R., Maturo, N., Navarro, M., Palomo, J. M., Paolini, E., Pfletschinger, S., Silva, P. F., Simone, L., and Vila-Valls, J.

Published
2016

23. On fuzzy syndrome hashing with LDPC coding

Author

Frattasi, S, Marchetti, N, Frattasi, S ( S ), Marchetti, N ( N ), Baldi, M, Bianchi, M, Chiaraluce, F, Rosenthal, J, Schipani, D, Frattasi, S, Marchetti, N, Frattasi, S ( S ), Marchetti, N ( N ), Baldi, M, Bianchi, M, Chiaraluce, F, Rosenthal, J, and Schipani, D

Abstract

The last decades have seen a growing interest in hash functions that allow some sort of tolerance, e.g. for the purpose of biometric authentication. Among these, the syndrome fuzzy hashing construction allows to securely store biometric data and to perform user authentication without the need of sharing any secret key. This paper analyzes such a model, showing that it offers a suitable protection against information leakage and several advantages with respect to similar solutions, like the fuzzy commitment scheme. The design and characterization of LDPC codes to be used for this purpose is also addressed.

Published
2011

24. A variant of the McEliece cryptosystem with increased public key security

Author

Augot, D, Canteaut, A, Augot, D ( D ), Canteaut, A ( A ), Baldi, M, Bianchi, M, Chiaraluce, F, Rosenthal, J, Schipani, D, Augot, D, Canteaut, A, Augot, D ( D ), Canteaut, A ( A ), Baldi, M, Bianchi, M, Chiaraluce, F, Rosenthal, J, and Schipani, D

Abstract

We propose a new variant of the McEliece cryptosystem which ensures that the code used as the public key is not permutation-equivalent to the secret code. This allows to increase the security of the public key, and to reconsider possible adoption of classical families of codes, like Reed-Solomon codes. A reduction in the key size or, equivalently, an increased level of security against information set decoding are the main advantages of the modified cryptosystem. As a drawback, the domain of intentional error vectors must be restricted, but we show that this has no significant impact on the security level.

Published
2011

35. Analysis and performance evaluation of new coding options for space telecommand links - part II: jamming channels.

Author

Baldi, M., Chiaraluce, F., Garello, R., Maturo, N., Aguilar Sanchez, I., and Cioni, S.

Subjects
TELECOMMUNICATION satellites, EARTH stations, RADAR interference, SPREAD spectrum communications, TELECOMMUNICATION systems
Abstract

In this paper, we study the performance of telecommand space links affected by pulsed, continuous wave and pseudo-noise jamming. Countermeasures include coding, interleaving, and direct sequence spread spectrum. Binary and non-binary low-density parity-check codes, parallel turbo codes, and soft-decision decoded BCH codes are considered. We investigate the impact of different decoding algorithms, also taking into account the role of jamming state information, spreading processing gain and interleaving. The results show that significant gains (up to more than 10 dB) can be achieved in a number of interesting scenarios. Copyright © 2014 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2015
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36. Analysis and performance evaluation of new coding options for space telecommand links - Part I: AWGN channels.

Author

Baldi, M., Chiaraluce, F., Garello, R., Maturo, N., Aguilar Sanchez, I., and Cioni, S.

Subjects
ASTRONAUTICAL communication systems, SPACE communication links, TELECOMMUNICATION satellites, ERROR rates, LOW density parity check codes
Abstract

We investigate and compare, over the additive white Gaussian noise channel, different options for updating the error correcting code currently used in space mission telecommand links. Besides some more consolidated proposals, using low-density parity-check codes, we characterize and assess the performance of alternative schemes, based on parallel turbo codes and soft-decision decoded Bose-Chaudhuri-Hocquenghem (BCH) codes. The analysis considers relevant metrics like the codeword error rate, the frame error rate, and the undetected frame error rate. The considered codes include binary and non-binary low-density parity-check codes, parallel turbo codes and extended BCH codes, with different decoding algorithms. The complexity of the various schemes and possible limits for their application are considered and discussed. Several numerical examples are provided. International Journal of Satellite Communications and Networking. Copyright © 2014 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2015
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