New Zero-knowledge Undeniable Signatures

Mao, Wenbo

HP Development Company

关键词: undeniable signatures;    efficient zero-knowledge protocols;   

RP-ID  :  HPL-2001-36

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 摘 要 】

We propose a new zero-knowledge undeniable signature scheme which is based on the intractability of computing high-order even powers modulo a composite. The new scheme has a number of desirable properties: (i) forgery of a signature (including existential forgery) is proven to be equivalent to factorisation, (ii) perfect zero- knowledge, (iii) efficient protocols for signature verification and non-signature denial: both measured by O (log k) (multiplications) where 1/k bounds the probability of error. For a denial protocol, this performance is unprecedented. 16 Pages