Cryptology ePrint Archive: Report 2014/945

Boomerang Attack on Step-Reduced SHA-512

Hongbo Yu, Dongxia Bai

Abstract: SHA-2 (SHA-224, SHA-256, SHA-384 and SHA-512) is hash function family issued by the National Institute of Standards and Technology (NIST) in 2002 and is widely used all over the world. In this work, we analyze the security of SHA-512 with respect to boomerang attack. Boomerang distinguisher on SHA-512 compression function reduced to 48 steps is proposed, with a practical complexity of $2^{51}$. A practical example of the distinguisher for 48-step SHA-512 is also given. As far as we know, it is the best practical attack on step-reduced SHA-512.

Category / Keywords: secret-key cryptography / SHA-512, hash functions, boomerang attack

Original Publication (in the same form): Inscrypt 2014

Date: received 16 Nov 2014

Contact author: yuhongbo at mail tsinghua edu cn

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Version: 20141119:111138 (All versions of this report)

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