New PDF release: Advances in Cryptology - ASIACRYPT 2010: 16th International

By Dmitry Khovratovich, Ivica Nikolić, Christian Rechberger (auth.), Masayuki Abe (eds.)

ISBN-10: 3642173721

ISBN-13: 9783642173721

ISBN-10: 364217373X

ISBN-13: 9783642173738

This booklet constitutes the refereed complaints of the sixteenth foreign convention at the concept and alertness of Cryptology and knowledge protection, ASIACRYPT 2010, held in Singapore, in December 2010. The 35 revised complete papers provided have been rigorously reviewed and chosen from 216 submissions. The papers are geared up in topical sections on hash assaults; symmetric-key cryptosystems; block and circulation ciphers; protocols; key trade; starting place; zero-knowledge; lattice-based cryptography; safe communique and computation; types, notions, and assumptions; and public-key encryption.

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Extra info for Advances in Cryptology - ASIACRYPT 2010: 16th International Conference on the Theory and Application of Cryptology and Information Security, Singapore, December 5-9, 2010. Proceedings

Example text

As we try to avoid useless computations, we mainly use operations on bits and not on 32-bit registers. We could use parallelism by building several systems at the same time, with different values of the Constant bits of the incoming chaining variable. Therefore we argue that the right metrics for evaluating the complexity of the attack is the number of elementary bitwise operations (AND, OR, XOR) it involves. To compare it to generic attacks, we use the analysis of Shamir and Dinur [10] and evaluate the number of bitwise operations in the Hamsi-256 compression function to about 10500.

The number of rounds in the permutation is 8 for ECHO-224 and -256, and 10 for ECHO384 and -512. At FSE 2010, Gilbert and Peyrin showed that the full-round (8-round) ECHO permutation could be distinguished from an ideal permutation with time of 2768 and memory of 2512 by using the Super-Sbox analysis [9]. After that, Peyrin [25,26] improved this attack which required 2512 in both time and memory. Because the 8-round ECHO permutation is a building block to generate 256-bit or 224-bit hash values and compression part from 2048-bits to 256- or 224-bits is not considered, the impact of this attack seems almost negligible.

We then apply this framework to the full-round (8-round) ECHO permutation by optimizing the attack with taking several properties specific to ECHO into account. 4] and [26, Appendix B]. 40 Y. Sasaki et al. Table 1. Comparison of attack results on ECHO and on Grøstl Target ECHO-256/-224 Permutation ECHO-256/-224 Single-pipe Comp. Func. Grøstl-256 Permutation Grøstl-512 Comp. Function Rounds Time Memory Attack Type Paper 8 (full) 8 (full) 8 (full) 7 7 3 3 8 8 8 7 7 2768 2512 2182 2128 2118 264 232 2112 264 248 2152 2152 2512 2512 237 232 238 264 238 264 264 28 264 256 Distinguisher Distinguisher Distinguisher Distinguisher Distinguisher Distinguisher Distinguisher Distinguisher Distinguisher Distinguisher Semi-free-start coll.

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Advances in Cryptology - ASIACRYPT 2010: 16th International Conference on the Theory and Application of Cryptology and Information Security, Singapore, December 5-9, 2010. Proceedings by Dmitry Khovratovich, Ivica Nikolić, Christian Rechberger (auth.), Masayuki Abe (eds.)


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