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Group signatures are broadly used to build E-voting, E-binding and fair E-cash systems. In 2004, Boneh et al proposed a short group signature (BBS04) and a group signature with verifier-local revocation (BS04). Both schemes are based on bilinear maps. In this paper, we revisit and improve them. The security of the revisited BBS04 scheme can be directly derived from the improved BS04. Our analysis...
We put forward a general attack against several group signatures. By checking whether schemes satisfy traceability, we show that the several group signatures are not secure. In contrast to those attacks against these schemes, the new attack is very understandable and simple. It's also the first time to show the scheme is insecure.
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