A Collision-Resistant Rate-1 Double-Block-Length Hash Function

Symmetric Cryptography

计算机科学;物理学

Stefan Lucks

Others  :  http://drops.dagstuhl.de/opus/volltexte/2007/1017/pdf/07021.LucksStefan.Paper.1017.pdf
PID  :  10472

学科分类：计算机科学（综合）

来源: CEUR

【 摘 要 】

This paper proposes a construction for collision resistant 2n-bit hash functions,based on n-bit block ciphers with 2n-bit keys. The construction is analysed in the ideal cipher model; for n = 128 an adversary would need roughly 2122 units of time to find a collision. The construction employs "combinatorial" hashing as an underlying building block (like Universal Hashing for cryptographic message authentication by Wegman and Carter). The construction runs at rate 1, thus improving on a similar rate 1/2 approach by Hirose (FSE 2006).