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Discrete logarithm variants of VSH

Arjen Lenstra, Dan Page, Martijn Stam, Discrete logarithm variants of VSH. Vietcrypt, pp. 229–242. November 2006. No electronic version available.

Abstract

Recent attacks on standardised hash functions such as SHA1 have reawakened interest in design strategies based on techniques common in provable security. In presenting the VSH hash function, a design based on RSA-like modular exponentiation, the authors introduce VSH-DL, a design based on exponentiation in DLP-based groups. In this article we explore a variant of VSH-DL that is based on cyclotomic subgroups of finite fields; we show that one can trade-off performance against bandwidth by using known techniques in such groups. Further, we investigate a variant of VSH-DL based on elliptic curves and and extract a tighter reduction to the underlying DLP in comparison to the original VSH-DL proposal.

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