Communications of the ACM
A method for obtaining digital signatures and public-key cryptosystems
Communications of the ACM
Society and Group Oriented Cryptography: A New Concept
CRYPTO '87 A Conference on the Theory and Applications of Cryptographic Techniques on Advances in Cryptology
Shared Generation of Authenticators and Signatures (Extended Abstract)
CRYPTO '91 Proceedings of the 11th Annual International Cryptology Conference on Advances in Cryptology
Threshold DSS Signatures without a Trusted Party
CRYPTO '95 Proceedings of the 15th Annual International Cryptology Conference on Advances in Cryptology
Generalized Threshold Cryptosystems
ASIACRYPT '91 Proceedings of the International Conference on the Theory and Applications of Cryptology: Advances in Cryptology
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
Group-Oriented Undeniable Signature Schemes without the Assistance of a Mutually Trusted Party
ASIACRYPT '92 Proceedings of the Workshop on the Theory and Application of Cryptographic Techniques: Advances in Cryptology
A New Threshold Group Signature Scheme Based on Discrete Logarithm Problem
SNPD '07 Proceedings of the Eighth ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing - Volume 03
A threshold cryptosystem without a trusted party
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
Threshold Undeniable RSA Signature Scheme
ICICS '01 Proceedings of the Third International Conference on Information and Communications Security
The Power of Proofs-of-Possession: Securing Multiparty Signatures against Rogue-Key Attacks
EUROCRYPT '07 Proceedings of the 26th annual international conference on Advances in Cryptology
Research note: Group-oriented undeniable signature schemes with a trusted center
Computer Communications
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Threshold cryptosystems allow n members of a group to share a private key such that any k of them can use the key without revealing its value. These systems can be divided into two categories, systems which use a trusted center to generate the shares and systems which create the shares in a distributed manner. This paper describes a number of security weaknesses which arise in systems which do not use a trusted center. We show that the n-out-of-n threshold undeniable signature scheme [8] has an actual security of only 2-out-of-n. The discrete log based threshold signature schemes [7, 11, 12] have a weakness in the key generation protocol. Finally, the generalized threshold cryptosystem [9] is not secure for some access structures.