International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Le Dong

Affiliation: Institute of Software Chinese Academy of Sciences

Publications

Year
Venue
Title
2015
EPRINT
2012
FSE
2010
EPRINT
Near-Collisions on the Reduced-Round Compression Functions of Skein and BLAKE
The SHA-3 competition organized by NIST aims to find a new hash standard as a replacement of SHA-2. Till now, 14 submissions have been selected as the second round candidates, including Skein and BLAKE, both of which have components based on modular addition, rotation and bitwise XOR (ARX). In this paper, we propose improved near-collision attacks on the reduced-round compression functions of Skein and a variant of BLAKE. The attacks are based on linear differentials of the modular additions. The computational complexity of near-collision attacks on a 4-round compression function of BLAKE-32, 4-round and 5-round compression functions of BLAKE-64 are 2^{21}, 2^{16} and 2^{216} respectively, and the attacks on a 24-round compression functions of Skein-256, Skein-512 and Skein-1024 have a complexity of 2^{60}, 2^{230} and 2^{395} respectively.

Coauthors

Dengguo Feng (1)
Jian Guo (1)
Bozhan Su (1)
Shuang Wu (2)
Wenling Wu (2)
Jian Zou (2)