A randomized protocol for signing contracts
Communications of the ACM
Round-Optimal and Abuse Free Optimistic Multi-party Contract Signing
ICALP '00 Proceedings of the 27th International Colloquium on Automata, Languages and Programming
Abuse-Free Optimistic Contract Signing
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in Cryptology
CRYPTO '00 Proceedings of the 20th Annual International Cryptology Conference on Advances in Cryptology
ASIACRYPT '01 Proceedings of the 7th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
1-out-of-n Signatures from a Variety of Keys
ASIACRYPT '02 Proceedings of the 8th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Constructing fair-exchange protocols for E-commerce via distributed computation of RSA signatures
Proceedings of the twenty-second annual symposium on Principles of distributed computing
Breaking and repairing optimistic fair exchange from PODC 2003
Proceedings of the 3rd ACM workshop on Digital rights management
Designated verifier proofs and their applications
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
Efficient identity based ring signature
ACNS'05 Proceedings of the Third international conference on Applied Cryptography and Network Security
Accumulators from bilinear pairings and applications
CT-RSA'05 Proceedings of the 2005 international conference on Topics in Cryptology
Generic construction of (identity-based) perfect concurrent signatures
ICICS'05 Proceedings of the 7th international conference on Information and Communications Security
Optimistic fair exchange of digital signatures
IEEE Journal on Selected Areas in Communications
Fair Exchange of Signatures with Multiple Signers
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Concurrent signatures with fully negotiable binding control
ProvSec'11 Proceedings of the 5th international conference on Provable security
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The concept of concurrent signatures was introduced by Chen, Kudla and Paterson at Eurocrypt 2004. In a concurrent signature scheme, users sign their messages in an ambiguous way so that the signatures are only verifiable by the users themselves but not by any other outsiders. At a later stage, one of the users releases an extra bit of information called the keystone, then all the signatures become binding to their signers concurrently. At this stage, any outsider can verify the signatures. Chen, Kudla and Paterson proposed a concurrent signature scheme for two users. Recently, Susilo and Mu constructed a scheme for three users. It is an open problem to construct concurrent signature schemes for multi users. In this paper, we answer this open problem affirmatively. Using techniques of ring signatures and bilinear pairings, for the first time we construct a concurrent signature scheme for multi-users.