A digital signature scheme secure against adaptive chosen-message attacks
SIAM Journal on Computing - Special issue on cryptography
Divertible zero knowledge interactive proofs and commutative random self-reducibility
EUROCRYPT '89 Proceedings of the workshop on the theory and application of cryptographic techniques on Advances in cryptology
Zero-knowledge undeniable signatures (extended abstract)
EUROCRYPT '90 Proceedings of the workshop on the theory and application of cryptographic techniques on Advances in cryptology
Random oracles are practical: a paradigm for designing efficient protocols
CCS '93 Proceedings of the 1st ACM conference on Computer and communications security
Efficient Identification and Signatures for Smart Cards
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
Convertible Undeniable Signatures
CRYPTO '90 Proceedings of the 10th Annual International Cryptology Conference on Advances in Cryptology
Non-Interactive Zero-Knowledge Proof of Knowledge and Chosen Ciphertext Attack
CRYPTO '91 Proceedings of the 11th Annual International Cryptology Conference on Advances in Cryptology
Wallet Databases with Observers
CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
Designated Confirmer Signatures and Public-Key Encryption are Equivalent
CRYPTO '94 Proceedings of the 14th Annual International Cryptology Conference on Advances in Cryptology
RSA-Based Undeniable Signatures
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
Efficient Group Signature Schemes for Large Groups (Extended Abstract)
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
Efficient Fair Exchange with Verifiable Confirmation of Signatures
ASIACRYPT '98 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
Proofs that yield nothing but their validity and a methodology of cryptographic protocol design
SFCS '86 Proceedings of the 27th Annual Symposium on Foundations of Computer Science
New convertible undeniable signature schemes
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
Security proofs for signature schemes
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
Interactive bi-proof systems and undeniable signature schemes
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
On Generic Constructions of Designated Confirmer Signatures
INDOCRYPT '09 Proceedings of the 10th International Conference on Cryptology in India: Progress in Cryptology
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In undeniable signature, a signature can only be verified with cooperation of the signer. If the signer refuses to cooperate, it is infeasible to check the validity of a signature. This problem is eliminated in confirmer signature schemes where the verification capacity is given to a confirmer rather than the signer. In this paper, we present a variation of confirmer signature, called undeniable confirmer signature in that both the signer and a confirmer can verify the validity of a signature. The scheme provides a better flexibility for the signer and the user as well as reduces the involvement of designated confirmers, who are usually trusted in practice. Furthermore, we show that our scheme is divertible, i.e., our signature can be blindly issued. This is essential in some applications such as subscription payment system, which is also shown.