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Cryptology ePrint Archive: Report 2009/317

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Cryptology ePrint Archive: Report 2009/317

Related-key Cryptanalysis of the Full AES-192 and AES-256

Alex Biryukov and Dmitry Khovratovich

Abstract: In this paper we present two related-key attacks on the full AES. For AES-256 we show the first key recovery attack that works for all the keys and has complexity $2^{119}$, while the recent attack by Biryukov-Khovratovich-Nikoli\'c works for a weak key class and has higher complexity. The second attack is the first cryptanalysis of the full AES-192. Both our attacks are boomerang attacks, which are based on the recent idea of finding {\em local collisions in block ciphers} and enhanced with the {\em boomerang switching} techniques to gain free rounds in the middle.

Category / Keywords: secret-key cryptography / AES-256, AES-192, related-key attack, local collisions, boomerang switching

Publication Info: Submitted to a conference.

Date: received 28 Jun 2009

Contact author: alex biryukov at uni lu

Available formats: PDF | BibTeX Citation

Version: 20090701:100720 (All versions of this report)

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