A digital multisignature scheme using bijective public-key cryptosystems
ACM Transactions on Computer Systems (TOCS)
One way hash functions and DES
CRYPTO '89 Proceedings on Advances in cryptology
Delegated multisignature scheme with document decomposition
Journal of Systems and Software
Society and Group Oriented Cryptography: A New Concept
CRYPTO '87 A Conference on the Theory and Applications of Cryptographic Techniques on Advances in Cryptology
A Practical Digital Multisignature Scheme Based on Discrete Logarithms
ASIACRYPT '92 Proceedings of the Workshop on the Theory and Application of Cryptographic Techniques: Advances in Cryptology
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
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Delegate multisignature scheme with document decomposition, introduced by Wu, Hung, and Guan, allow each signatory only signs a part of the document according to the signatory's knowledge domain. In some applications, it is indeed more efficient than the traditional multisignature schemes that each signatory must sign the whole document. However, there is a disadvantage of this scheme. An adversary can make the signature collector (SC) to verify individual signatures successfully, although the result in generating a multisugnature that cannot pass the multisignature verification. This is inefficient because SC cannot identify which partial signature is wrong. If the multisignature cannot pass the verification, then all participant signatories have to resend their partial signature. In this paper, we will show this disadvantage and then improve the Wu-Hung-Guan's delegated multisignature scheme to remedy this disadvantage.