By Alex Biryukov, Dmitry Khovratovich (auth.), Mitsuru Matsui (eds.)
This ebook constitutes the refereed complaints of the fifteenth foreign convention at the conception and alertness of Cryptology and data protection, ASIACRYPT 2009, held in Tokyo, Japan, in December 2009.
The forty-one revised complete papers provided have been conscientiously reviewed and chosen from 298 submissions. The papers are geared up in topical sections on block ciphers, quantum and post-quantum, hash features I, encryption schemes, multi social gathering computation, cryptographic protocols, hash funtions II, types and frameworks I, cryptoanalysis: sq. and quadratic, types and framework II, hash services III, lattice-based, and facet channels.
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Extra info for Advances in Cryptology – ASIACRYPT 2009: 15th International Conference on the Theory and Application of Cryptology and Information Security, Tokyo, Japan, December 6-10, 2009. Proceedings
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. We summarize our attacks and previous attacks in Table 1, where the data complexity is measured in the number of plaintexts and the time complexity is measured in the number of encryptions needed in the attack.
In order to fulﬁll Condition (c), we have to guess Z43 and then according to this guess, to choose P4 and P4 which satisfy ΔY43 = 8000x. By Proposition 1, Δs3 is equal to zero. In order to get the right hand side of Equation (9), we still need to get Δs5 , Δs6 , Δs7 . We need to guess Z55 , Z16 , Z26 , Z56 , Z66 , Z17 , Z27 , Z37 , Z47 Z57 , Z67 , Z18 , Z28 , Z38 , Z48 . As shown in , one can partially decrypt one pair of encryptions using these 15 subkeys to calculate the values of Δs5 , Δs6 , Δs7 .
Kr ) for which there exist x1 , . . , xr such that we have both 1 w(E) was denoted as KeysE in . Cascade Encryption Revisited Kr−i+1 Kr−i+2 K K K 43 Kr−i x0 → x1 → · · · →r xi and S −1 (xi ) →1 xi+1 →2 · · · → xr . When describing chains, we sometimes explicitly refer to the permutations instead of the keys that deﬁne them. For disconnected chains, we sometimes omit the reference to the permutation S if it is clear from the context. The purpose of the following deﬁnition will be clear from the proof of Theorem 1.