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3 results on '"Kazutoshi Fujikawa"'

1. Fast Modular Arithmetic on the Kalray MPPA-256 Processor for an Energy-Efficient Implementation of ECM

Author

Atsuo Inomata, Pierrick Gaudry, Masahiro Ishii, Kazutoshi Fujikawa, Jérémie Detrey, Nara Institute of Science and Technology, Cryptology, arithmetic : algebraic methods for better algorithms (CARAMBA), Department of Algorithms, Computation, Image and Geometry (LORIA - ALGO), Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Inria Nancy - Grand Est, Institut National de Recherche en Informatique et en Automatique (Inria), Information iniTiative Center (ITC), IMPACT-DIGITRUST, Inria Nancy - Grand Est, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Department of Algorithms, Computation, Image and Geometry (LORIA - ALGO), Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), and Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Elliptic curve method, Modular arithmetic, Computer science, [INFO.INFO-AO]Computer Science [cs]/Computer Arithmetic, Context (language use), 010103 numerical & computational mathematics, 02 engineering and technology, Parallel computing, 01 natural sciences, Theoretical Computer Science, Elliptic curve, [INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], Computational Theory and Mathematics, Hardware and Architecture, Very long instruction word, Kalray MPPA-256 manycore processor, 0202 electrical engineering, electronic engineering, information engineering, Integer factorization, 020201 artificial intelligence & image processing, 0101 mathematics, Software, Multiprecision modular arithmetic, Efficient energy use
Abstract

International audience; The Kalray MPPA-256 processor is based on a recent low-energy manycore architecture. In this article, we investigate its performance in multiprecision arithmetic for number-theoretic applications. We have developed a library for modular arithmetic that takes full advantage of the particularities of this architecture. This is in turn used in an implementation of the ECM, an algorithm for integer factorization using elliptic curves. For parameters corresponding to a cryptanalytic context, our implementation compares well to state-of-the-art implementations on GPU, while using much less energy.

Published
2017
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2. On the Experimental Evaluation of Vehicular Networks: Issues, Requirements and Methodology Applied to a Real Use Case

Author

Kazutoshi Fujikawa, Manabu Tsukada, Satoshi Matsuura, Thierry Ernst, José Santa, Robotics & Intelligent Transportation Systems (RITS), Inria Paris-Rocquencourt, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Department of Creative Informatics, Graduate School of Information Science and Technology, the University of Tokyo (UTokyo), Department of Creative Informatics-Department of Creative Informatics, Department of Information and Communications Engineering [Murcia], Universidad de Murcia, University Centre of Defence at the Spanish Air Force Academy, Tokyo Institute of Technology [Tokyo] (TITECH), Centre de Robotique (CAOR), Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Nara Institute of Science and Technology - Graduate School of Information Science (NAIST), Nara Institute of Science and Technology, and MINES ParisTech - École nationale supérieure des mines de Paris

Subjects
Routing protocol, FOS: Computer and information sciences, lcsh:Computer engineering. Computer hardware, Computer Networks and Communications, Computer science, Network Mobility, lcsh:TK7885-7895, 02 engineering and technology, lcsh:TA168, Intelligent Transportation Systems, Computer Science - Networking and Internet Architecture, [INFO.INFO-MC]Computer Science [cs]/Mobile Computing, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Software, Wireless Multihop Communication, 0502 economics and business, 0202 electrical engineering, electronic engineering, information engineering, [INFO.INFO-RB]Computer Science [cs]/Robotics [cs.RO], [INFO]Computer Science [cs], Telematics, Protocol (science), Networking and Internet Architecture (cs.NI), 050210 logistics & transportation, Vehicular ad hoc network, business.industry, 05 social sciences, Network mobility, 020206 networking & telecommunications, Vehicular Ad-hoc Networks, Computer Science Applications, IPv6, Control and Systems Engineering, lcsh:Systems engineering, Experimental Evaluation, Systems engineering, Key (cryptography), Cooperative ITS, business, Information Systems, Test data
Abstract

One of the most challenging fields in vehicular communications has been the experimental assessment of protocols and novel technologies. Researchers usually tend to simulate vehicular scenarios and/or partially validate new contributions in the area by using constrained testbeds and carrying out minor tests. In this line, the present work reviews the issues that pioneers in the area of vehicular communications and, in general, in telematics, have to deal with if they want to perform a good evaluation campaign by real testing. The key needs for a good experimental evaluation is the use of proper software tools for gathering testing data, post-processing and generating relevant figures of merit and, finally, properly showing the most important results. For this reason, a key contribution of this paper is the presentation of an evaluation environment called AnaVANET, which covers the previous needs. By using this tool and presenting a reference case of study, a generic testing methodology is described and applied. This way, the usage of the IPv6 protocol over a vehicle-to-vehicle routing protocol, and supporting IETF-based network mobility, is tested at the same time the main features of the AnaVANET system are presented. This work contributes in laying the foundations for a proper experimental evaluation of vehicular networks and will be useful for many researchers in the area., in EAI Endorsed Transactions on Industrial Networks and Intelligent Systems, 2014

Published
2014
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3. Design and field evaluation of geographical location-aware service discovery on IPv6 GeoNetworking for VANET

Author

Manabu Tsukada, Kazutoshi Fujikawa, Astuo Inomata, Satoru Noguchi, Thierry Ernst, Graduate School of Information Science, Nara Institute of Science and Technology, La Route Automatisée (LARA), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut National de Recherche en Informatique et en Automatique (Inria)-Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), and Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut National de Recherche en Informatique et en Automatique (Inria)-MINES ParisTech - École nationale supérieure des mines de Paris

Subjects
VANET, Vehicular communication systems, IPv6, Computer Networks and Communications, Computer science, computer.internet_protocol, service discovery, multicast, Service discovery, field evaluation, 02 engineering and technology, Network simulation, ITS applications, 0202 electrical engineering, electronic engineering, information engineering, [INFO]Computer Science [cs], 020203 distributed computing, Vehicular ad hoc network, Multicast, business.industry, Network packet, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, 020206 networking & telecommunications, ns-3 network simulator, Computer Science Applications, Signal Processing, IP multicast, GeoNetworking, business, computer, Computer network
Abstract

International audience; Service discovery is an essential component for distributed mobile applications in vehicular communication systems. While there have been numerous service discovery protocols, applications for vehicular communication systems pose additional requirements: discover services according to geographical position inside dynamic mobile environments. In this article, we propose a geographical location aware service discovery mechanism for vehicular ad-hoc networks (VANETs). The proposed mechanism exploits an IPv6 multicast service discovery protocol on IPv6 GeoNet-working specified by the GeoNet project. Thanks to the GeoBroadcast mechanism, it efficiently propagates service discovery messages to a subset of nodes inside a relevant geographical area with encapsulating IPv6 multicast packets. We implemented the proposed mechanism to the ns-3 network simulator, furthermore we integrated the prototype system using CarGeo6, an open source implementation of IPv6 GeoNetworking, with openSLP. Our simulation and real field evaluation results show the system can discover services with low latency and low bandwidth usage in VANETs even via multi-hop.

Published
2012

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