A method for obtaining digital signatures and public-key cryptosystems
Communications of the ACM
Two efficient RSA multisignature schemes
ICICS '97 Proceedings of the First International Conference on Information and Communication Security
A Digital Multisignature Scheme Based on the Fiat-Shamir Scheme
ASIACRYPT '91 Proceedings of the International Conference on the Theory and Applications of Cryptology: Advances in Cryptology
On the Risk of Disruption in Several Multiparty Signature Schemes
ASIACRYPT '96 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
Digital multi-signature scheme based on the elliptic curve cryptosystem
Journal of Computer Science and Technology
Certificateless strong designated verifier multisignature scheme using bilinear pairings
Proceedings of the International Conference on Advances in Computing, Communications and Informatics
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The concept of multisignature, in which multiple signers can cooperate to sign the same message and any verifier can verify the validity of the multi-signature, was first introduced by Itakura and Nakamura. Several multisignature schemes have been proposed since. Chen et al. proposed a new digital multi-signature scheme based on the elliptic curve cryptosystem recently. In this paper, we show that their scheme is insecure, for it is vulnerable to the so-called active attacks, such as the substitution of a "false" public key to a "true" one in a key directory or during transmission. And then the attacker can sign a legal signature which other users have signed and forge a signature himself which can be accepted by the verifier.