Improved single-key attacks on 8-round AES-192 and AES-256.

*(English)*Zbl 1321.94055Summary: AES is the most widely used block cipher today, and its security is one of the most important issues in cryptanalysis. After 13 years of analysis, related-key attacks were recently found against two of its flavors (AES-192 and AES-256). However, such a strong type of attack is not universally accepted as a valid attack model, and in the more standard single-key attack model at most 8 rounds of these two versions can be currently attacked. In the case of 8-round AES-192, the only known attack (found 10 years ago) is extremely marginal, requiring the evaluation of essentially all the \(2^{128}\) possible plaintext/ciphertext pairs in order to speed up exhaustive key search by a factor of 16. In this paper we introduce three new cryptanalytic techniques, and use them to get the first non-marginal attack on 8-round AES-192 (making its time complexity about a million times faster than exhaustive search, and reducing its data complexity to about 1/32,000 of the full codebook). In addition, our new techniques can reduce the best known time complexities for all the other combinations of 7-round and 8-round AES-192 and AES-256.

This paper is an extended version of [Asiacrypt 2010, Lect. Notes Comput. Sci. 6477, 158–176 (2010; Zbl 1253.94045)].

This paper is an extended version of [Asiacrypt 2010, Lect. Notes Comput. Sci. 6477, 158–176 (2010; Zbl 1253.94045)].

##### MSC:

94A60 | Cryptography |

##### Keywords:

AES; cryptanalysis; single-key attacks; multiset tabulation; differential enumeration; key bridging##### Software:

LEX
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\textit{O. Dunkelman} et al., J. Cryptology 28, No. 3, 397--422 (2015; Zbl 1321.94055)

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##### References:

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