[Resource Topic] 2009/238: Attacks on Round-Reduced BLAKE

Welcome to the resource topic for 2009/238

Title:
Attacks on Round-Reduced BLAKE

Authors: LI Ji, XU Liangyu

Abstract:

BLAKE is a new hash family proposed for SHA-3. The core of compression function reuses the core function of ChaCha. A round-dependent permutation is used as message schedule. BLAKE is claimed to achieve full diffusion after 2 rounds. However, message words can be controlled on the first several founds. By exploiting properties of message permutation, we can attack 2.5 reduced rounds. The results do not threat the security claimed in the specification.

ePrint: https://eprint.iacr.org/2009/238

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