Cetin K. Koc - Böcker

This book constitutes the thoroughly refereed post-proceedings of the 4th International Workshop on Cryptographic Hardware and Embedded Systems, CHES 2002, held in Redwood Shores, California, USA in August 2002. The 41 revised full papers presented together with two invited contributions were carefully selected from 101 submissions during two rounds of reviewing and revision. The papers are organized in topical sections on attack strategies, finite field and modular arithmetic, elliptic curve cryptography, AES and AES candidates, tamper resistance, RSA implementation, random number generation, new primitives, hardware for cryptanalysis.

These are the proceedings of CHES 2003, the ?fth workshop on Cryptographic HardwareandEmbeddedSystems,heldinCologneonSeptember8-10,2003.As with every previous workshop, there was a record number of submissions despite themuchearlierdeadlineinthisyear'scallforpapers.Thisisaclearindication of the growing international importance of the scope of the conference and the relevance of the subject material to both industry and academia. The increasing competition for presenting at the conference has led to many excellent papers and a higher standard overall. From the 111 submissions, time constraintsmeantthatonly32couldbeaccepted.Theprogramcommitteewo- ed very hard to select the best. However, at the end of the review process there were a number of good papers - which it would like to have included but for which, sadly, there was insu?cient space. In addition to the accepted papers appearing in this volume, there were three invited presentations from Hans D- bertin (Ruhr-Universit. at Bochum, Germany), Adi Shamir (Weizmann Institute, Israel), and Frank Stajano (University of Cambridge, UK), and a panel d- cussion on the e?ectiveness of current hardware and software countermeasures against side channel leakage in embedded cryptosystems.

These are the pre-proceedings of CHES 2000, the second workshop on Cryp- graphicHardware andEmbedded Systems. The rst workshop, CHES'99, which was held at WPI in August 1999, was received quite enthusiastically by people in academia and industry who are interested in hardware and software imp- mentations of cryptography. We believe there has been a long-standing need for a workshop series combining theory and practice for integrating strong data - curity into modern communications and e-commerce applications. We are very glad that we had the opportunity to serve this purpose and to create the CHES workshop series. As is evident by the papers in these proceedings, there have been many excellentcontributions.Selectingthepapersforthisyear'sCHESwasnotaneasy task, and we regret that we had to reject several good papers due to the limited availability of time. There were 51 submitted contributions to CHES 2000, of which 25 were selected for presentation. This corresponds to a paper acceptance rate of 49% for this year, which is a decrease from the 64% acceptance rate for CHES'99.Allpaperswerereviewed.Inadditiontothecontributedpresentations, we have invited two speakers.As last year, the focus of the workshop is on all aspects of cryptographic hardware and embedded system design. Of special interest were contributions that describe new methods for e cient hardware implementations and hi- speed software for embedded systems, e.g., smart cards, microprocessors, DSPs, etc. In addition, there were again several very interesting and innovative - pers dealingwith cryptanalysis in practice, rangingfrom side-channel attacks to FPGA-based attack hardware.

This book constitutes the thoroughly refereed post-proceedings of the Third International Workshop on Cryptoanalysis Hardware and Embedded Systems, CHES 2001, held in Paris, France in Mai 2001. The 31 revised full papers presented were carefully reviewed and selected from 66 submissions. The papers are organized in topical sections on side channel attacks, Rijndael hardware implementation, random number generators, elliptic curve algorithms, arithmetic architectures, cryptanalysis, embedded implementations of ciphers, and side channel attacks on elliptic curve cryptosystems.