Download Advances in Cryptology - ASIACRYPT 2009: 15th International by Mitsuri Matsui PDF

By Mitsuri Matsui

This publication constitutes the refereed court cases of the fifteenth overseas convention at the conception and alertness of Cryptology and knowledge safety, ASIACRYPT 2009, held in Tokyo, Japan, in December 2009.

The forty-one revised complete papers provided have been rigorously reviewed and chosen from 298 submissions. The papers are prepared in topical sections on block ciphers, quantum and post-quantum, hash features I, encryption schemes, multi celebration computation, cryptographic protocols, hash funtions II, versions and frameworks I, cryptoanalysis: sq. and quadratic, versions and framework II, hash services III, lattice-based, and aspect channels.

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Additional info for Advances in Cryptology - ASIACRYPT 2009: 15th International Conference on the Theory and Application of Cryptology and Information Security, Tokyo, Japan, ... Computer Science / Security and Cryptology)

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The purpose of the following definition will be clear from the proof of Theorem 1. Definition 3. Let S be a fixed permutation. A distinguisher examines the key tuple (K1 , K2 , . . t. t. S for (K1 , K2 , . . , Kr ) for any i ∈ {1, . . , r − 1}. 3 The Security of Cascade Encryption In this section we reestablish the lower bound on the security of triple encryption from [4] in a more general setting. Our goal here is to simplify the proof and make it more comprehensible thanks to the level of abstraction provided by the random systems framework.

Wm )] + · · · + fm (W1 + W2 + . . Wm−1 + Rm ) m = i−1 m fi Ri + i=1 (fi i=1 m m Wj ) + α j=1 (fi i=1 Wj ) j=i+1 (2) If the attack is performed in the order of (Ps1 , Us1 ), (Ps2 , Us2 ), . . , (Psm , Usm ), where s1 , s2 , . . , sm is a permutation of 1, 2, . . , m. The expected time is m Φ = m fsi Rsi + i=1 i−1 (fsi i=1 m Wsj ) + α j=1 m (fsi i=1 Wsj ) j=i+1 fi Wj + αfj Wi occurs in Φ if and only if j < i and occurs in Φ if and only if j < i where si = i and sj = j. Hence Φ−Φ = (fi Wj + αfj Wi − fj Wi − αfi Wj ) ji Since α ≤ 1 and fi Wj − fj Wi ≤ 0 for j < i, Φ − Φ ≤ 0 for any permutation s1 , s2 , .

This makes it possible to perform the key-dependent attack on IDEA. Biryukov-Demirci Equation is used to recover the intermediate values from encryptions. 1 encryptions. 1 encryptions. These attacks use both fewer chosen The Key-Dependent Attack on Block Ciphers 21 Table 1. 1 Ref. 2 CP - Chosen Plaintext, KP - Known Plaintext. † Attack on IDEA starting from the first round. plaintexts and less time than all the previous corresponding attacks. We also give two key-dependent attacks on 5-round IDEA starting from the first round.

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