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CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
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ID-Based Blind Signature and Ring Signature from Pairings
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Linkability Analysis of Some Blind Signature Schemes
Computational Intelligence and Security
Forgeability attack of two DLP-base proxy blind signature schemes
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Linkability of a blind signature scheme and its improved scheme
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A forward secure blind signature scheme was proposed by Duc, Cheon and Kim, in ICICS 2003. The security of the scheme was proved to be equivalent to the strong RSA assumption in the random oracle model. In this paper we present an attack to the scheme by forging valid signatures with public keys only. The attack is so efficient that forging a valid signature needs less computation than legally generating a signature, even considering only the user side. Our result implies that the security proof of the scheme must be invalid. Furthermore we point out the fault of the proof and explain why it invalidates the proof.