Cryptology ePrint Archive: Report 2004/316
On a Threshold Group Signature Scheme and a Fair Blind Signature Scheme
Abstract: In the paper, we analyze two signature schemes.
The first is a $(t_j, t, n) $ threshold group
signature scheme proposed by Shi and Feng in . The second
is a fair blind signature scheme proposed by Feng in . Our
results show that both schemes are forgeable.
Besides, we introduce a concept, i.e., suspended factor, to describe the common error in designing signature scheme, which means that some signature data lie at neither base position nor exponent position in verifying equation, instead lie at factor position solely .
Category / Keywords: cryptographic protocols / threshold group signature scheme, fair blind signature scheme, universal forgeability, suspended factor.
Date: received 18 Nov 2004
Contact author: zjcamss at hotmail com
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Version: 20041119:070951 (All versions of this report)
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