## Improved single-key attacks on 8-round AES-192 and AES-256.(English)Zbl 1253.94045

Abe, Masayuki (ed.), Advances in cryptology – ASIACRYPT 2010. 16th international conference on the theory and application of cryptology and information security, Singapore, December 5–9, 2010. Proceedings. Berlin: Springer (ISBN 978-3-642-17372-1/pbk). Lecture Notes in Computer Science 6477, 158-176 (2010).
Summary: 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.
For the entire collection see [Zbl 1202.94006].

### MSC:

 94A60 Cryptography
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