By Yu Sasaki (auth.), Ali Miri, Serge Vaudenay (eds.)
ISBN-10: 3642284957
ISBN-13: 9783642284953
ISBN-10: 3642284965
ISBN-13: 9783642284960
This publication constitutes the completely refereed post-conference lawsuits of the 18th Annual overseas Workshop on chosen parts in Cryptography, SAC 2011, held in Toronto, Canada in August 2011. The 23 revised complete papers offered including 2 invited papers have been rigorously reviewed and chosen from ninety two submissions. The papers are geared up in topical sections on cryptanalysis of hash features, safety in clouds, bits and randomness, cryptanalysis of ciphers, cryptanalysis of public-key crypthography, cipher implementation, new designs and mathematical features of utilized cryptography.
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Additional resources for Selected Areas in Cryptography: 18th International Workshop, SAC 2011, Toronto, ON, Canada, August 11-12, 2011, Revised Selected Papers
Example text
States used to merge the two inbound phases with the chaining values. The merge inbound phase consists of three parts. Brown bytes show values already determined (first part) and gray values are chosen at random (second part). Green, blue, yellow and red bytes show independent values used in the generalized birthday attack (third part) and cyan bytes represent values with the target conditions. to state S14 . Note that we need to try 22×8+1 values for AES state S7 [2, 1] to also match the 2-byte (cyan) and 1-bit padding at the input in AES state S0 [2, 3].
Be Abstract. This paper deals with definitional aspects of the herding attack of Kelsey and Kohno, and investigates the provable security of several hash functions against herding attacks. Firstly, we define the notion of chosen-target-forced-midfix (CTFM) as a generalization of the classical herding (chosen-target-forced-prefix) attack to the cases where the challenge message is not only a prefix but may appear at any place in the preimage. Additionally, we identify four variants of the CTFM notion in the setting where salts are explicit input parameters to the hash function.
In general, the dimension of the output vector space is defined by the number of active bytes prior to the linear transformations in the last round (16 active bytes after the last SubBytes), combined with the number of active bytes at the input due to the feed-forward (0 active bytes in our case). This would results in a vector space dimension of (16 + 0) × 8 = 128. However, a weakness in the combined transformations SuperMixColumns, BigFinal and the output truncation reduces the vector space to a dimension of 64 at the output of the hash function for the truncated differential path in Figure 2.
Selected Areas in Cryptography: 18th International Workshop, SAC 2011, Toronto, ON, Canada, August 11-12, 2011, Revised Selected Papers by Yu Sasaki (auth.), Ali Miri, Serge Vaudenay (eds.)
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