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Cryptanalysis of Two New Signature Schemes
Authors: Fangguo Zhang, Kwangjo KimAbstract:
Group signature and blind signature are very important primitives
in cryptography. A group signature scheme allows a group member to
sign messages anonymously on behalf of the group and a blind
signature scheme can ensure anonymity of the sender of a message.
Recently, S. Xia and J. You proposed a group
signature scheme with strong separability in which the revocation
manager can work without the involvement of the membership manager
and J.J-R. Chen and A.P. Chen proposed a blind
signature scheme based on dual complexities (which combines
factorization and discrete logarithm problem). In this paper, we
give a universal forgery attack on Xia-You’s group signature
scheme which any one (not necessarily a group member) can produce
a valid group signature on an arbitrary message, and it is
untraceable by the group revocation manager. For Chen-Chen’s blind
signature scheme, we show that it could not meet the
untraceability property of a blind signature, i.e., it could not
ensure anonymity of the user.
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