By Emilia Käsper, Peter Schwabe (auth.), Christophe Clavier, Kris Gaj (eds.)
This publication constitutes the refereed complaints of the eleventh overseas Workshop on Cryptographic and Embedded structures, CHES 2009, held in Lausanne, Switzerland in the course of September 6-9, 2009.
The e-book includes three invited talks and 29 revised complete papers which have been rigorously reviewed and chosen from 148 submissions. The papers are geared up in topical sections on software program implementations, aspect channel research of mystery key cryptosystems, aspect channel research of public key cryptosystems, aspect channel and fault research countermeasures, pairing-based cryptography, new ciphers and effective implementations, TRNGs and machine id, trojans and depended on ICs, theoretical points, and fault analysis.
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Additional resources for Cryptographic Hardware and Embedded Systems - CHES 2009: 11th International Workshop Lausanne, Switzerland, September 6-9, 2009 Proceedings
This work can be adapted to several other primitives using the AES S-box such as the stream cipher LEX, the block cipher Camellia and the hash function Fugue. We focus on Intel’s SSSE3 and Motorola’s Altivec, but our techniques can be adapted to other systems with vector permute instructions, such as the IBM Xenon and Cell processors, the ARM Cortex series and the forthcoming AMD “Bulldozer” core. Keywords: AES, AltiVec, SSSE3, vector permute, composite ﬁelds, cache-timing attacks, fast implementations.
So to transfer 128-, 192-, and 256-bit AES keys, we need at least 26, 39, and 52 F31 blocks, respectively. Packing Fq -blocks into binary can be more “wasteful” in the sense that one can use more bits than necessary, as long as the map is injective and convenient to compute. For example, we have opted for a very simple packing strategy in which every three F31 blocks are ﬁt in a 16-bit word. 2 Basic Arithmetic Operations and Inversion Mod q Fq operations for odd prime q uses many modulo-q. We almost always replace slow division instructions with multiplication as follows.
Wn ) ∈ Kn → z = (p1 (w), p2 (w), . . , pm (w)) ∈ Km . C. Clavier and K. ): CHES 2009, LNCS 5747, pp. 33–48, 2009. -T. Chen et al. Polynomials p1 , p2 , . . have (almost always) been quadratic since MPKCs came to public notice . Since this is public-key cryptography, we can let P(0) = 0. Of course, a random P would not be invertible by the legitimate user, so almost always P = T ◦ Q ◦ S with two aﬃne maps S : w → x = MS w + cS and T : y → z = MT y + cT , and an “eﬃciently invertible” quadratic map Q : x → y.
Cryptographic Hardware and Embedded Systems - CHES 2009: 11th International Workshop Lausanne, Switzerland, September 6-9, 2009 Proceedings by Emilia Käsper, Peter Schwabe (auth.), Christophe Clavier, Kris Gaj (eds.)