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2005
Springer

On the Security of Some Nonrepudiable Threshold Proxy Signature Schemes

10 years 11 months ago
On the Security of Some Nonrepudiable Threshold Proxy Signature Schemes
A (t, n) threshold proxy signature scheme enables an original signer to delegate the signature authority to a proxy group of n member such that t or more than t proxy signers can cooperatively sign messages on behalf of the original signer. In the paper, we review the security of some nonrepudiable threshold proxy signature schemes with known signers. We show that Sun’s threshold proxy scheme, Yang et al.’s threshold proxy signature scheme and Tzeng et al.’s threshold proxy signature scheme are insecure against an original signer’s forgery. We also show that Hsu et al.’s threshold proxy signature scheme suffers from the conspiracy of the original signer and the secret share dealer SA, and that Hwang et al.’s threshold proxy signature scheme is universally forgeable. In a word, none of the above-mentioned threshold proxy signature schemes can provide non-repudiation. Key Words: Cryptography; Digital signature; Proxy signature; Threshold proxy signature
Zuowen Tan, Zhuojun Liu, Wang Mingsheng
Added 28 Jun 2010
Updated 28 Jun 2010
Type Conference
Year 2005
Where ISPEC
Authors Zuowen Tan, Zhuojun Liu, Wang Mingsheng
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