Cryptology ePrint Archive: Report 2015/1085
Malicious Keccak
Pawel Morawiecki
Abstract: In this paper, we investigate Keccak --- the cryptographic hash function adopted as the SHA-3 standard. We propose a malicious variant of the function, where new round constants are introduced. We show that for such the variant, collision and preimage attacks are possible. We also identify a class of weak keys for the malicious Keccak working in the MAC mode. Ideas presented in the paper were verified by implementing the attacks on the function with the 128-bit hash.
Category / Keywords: secret-key cryptography / cryptanalysis, Keccak, SHA-3, malicious hashing
Date: received 8 Nov 2015
Contact author: pawel morawiecki at gmail com
Available format(s): PDF | BibTeX Citation
Version: 20151109:092516 (All versions of this report)
Short URL: ia.cr/2015/1085
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