Identity-Based Encryption from the Weil Pairing
CRYPTO '01 Proceedings of the 21st Annual International Cryptology Conference on Advances in Cryptology
A One Round Protocol for Tripartite Diffie-Hellman
ANTS-IV Proceedings of the 4th International Symposium on Algorithmic Number Theory
Perfect Concurrent Signature Protocol
SNPD '07 Proceedings of the Eighth ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing - Volume 01
Security proofs for signature schemes
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
The fairness of perfect concurrent signatures
ICICS'06 Proceedings of the 8th international conference on Information and Communications Security
Efficient identity based ring signature
ACNS'05 Proceedings of the Third international conference on Applied Cryptography and Network Security
Generic construction of (identity-based) perfect concurrent signatures
ICICS'05 Proceedings of the 7th international conference on Information and Communications Security
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The concept of concurrent signatures was introduced by Chen, Kudla and Paterson at Eurocrypt 2004, which allows two parties to produce two ambiguous signatures until the initial signer releases an extra piece of information (called keystone). Once the keystone is released, both signatures are bound to their true signers concurrently. However, Susilo, Mu and Zhang pointed out the original concurrent signature is not ambiguous to any third party if both signers are known to be trustworthy, and further proposed perfect concurrent signatures to strengthen the ambiguity of concurrent signatures in ICICS 2004. Unfortunately, Susilo et al.’s schemes are unfair for the matching signer because they enable the initial signer to release a carefully prepared keystone that binds the matching signer’s signature, but not the initial signer’s. Therefore, we present a fair identity based concurrent signature in an effective way to correct these flaws in ambiguity and fairness. Moreover, our scheme is more efficient than other concurrent signature schemes based on the bilinear paring.