Attacks on Round-Reduced BLAKE

LI Ji; XU Liangyu

Paper 2009/238

Attacks on Round-Reduced BLAKE

LI Ji and 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.

Metadata

Available format(s): PDF
Publication info: Published elsewhere. Unknown where it was published
Keywords: hash functions
Contact author(s): ji li @ sony com cn
History: 2009-05-30: received
Short URL: https://ia.cr/2009/238
License: CC BY

BibTeX

@misc{cryptoeprint:2009/238,
      author = {LI Ji and XU Liangyu},
      title = {Attacks on Round-Reduced {BLAKE}},
      howpublished = {Cryptology {ePrint} Archive, Paper 2009/238},
      year = {2009},
      url = {https://eprint.iacr.org/2009/238}
}