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2015 | OriginalPaper | Buchkapitel

Improved Single-Key Attacks on 9-Round AES-192/256

verfasst von : Leibo Li, Keting Jia, Xiaoyun Wang

Erschienen in: Fast Software Encryption

Verlag: Springer Berlin Heidelberg

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Abstract

This paper focuses on key-recovery attacks on 9-round AES-192 and AES-256 under single-key model with the framework of the meet-in-the-middle attack. A new technique named key-dependent sieve is introduced to further reduce the size of lookup table of the attack, and the 9-round AES-192 is broken with \(2^{121}\) chosen plaintexts, \(2^{187.5}\) 9-round encryptions and \(2^{185}\) 128-bit words of memory. If the attack starts from the third round, the complexities would be further reduced by a factor of 16. Moreover, the whole attack is split up into a series of weak-key attacks. Then the memory complexity of the attack is saved significantly when we execute these weak attacks in streaming mode. This method is also applied to reduce the memory complexity of the attack on 9-round AES-256.

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Metadaten
Titel
Improved Single-Key Attacks on 9-Round AES-192/256
verfasst von
Leibo Li
Keting Jia
Xiaoyun Wang
Copyright-Jahr
2015
Verlag
Springer Berlin Heidelberg
DOI
https://doi.org/10.1007/978-3-662-46706-0_7