A Digital Nominative Proxy Signature Scheme for Mobile Communication
ICICS '01 Proceedings of the Third International Conference on Information and Communications Security
Disallowing Unauthorized State Changes of Distributed Shared Objects
Proceedings of the IFIP TC11 Fifteenth Annual Working Conference on Information Security for Global Information Infrastructures
A Law-Abiding Peer-to-Peer Network for Free-Software Distribution
NCA '01 Proceedings of the IEEE International Symposium on Network Computing and Applications (NCA'01)
Identity based proxy multi-signature
Journal of Systems and Software
Aggregate and verifiably encrypted signatures from bilinear maps
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Identity-Based aggregate signatures
PKC'06 Proceedings of the 9th international conference on Theory and Practice of Public-Key Cryptography
An improved discrete logarithm-based multisignature scheme
Security and Communication Networks
A novel anonymous proxy signature scheme
Advances in Multimedia
| Hi-index | 0.00 |
A proxy signature scheme allows a proxy signer to sign messages on behalf of an original signer, a company or an organization. A proxy multi-signature scheme is an extension of the basic proxy signature scheme, and permits two or more original signers to delegate their signing powers to the same proxy signer. Recently, Wang and Cao proposed an identity-based proxy multi-signature scheme. This scheme is very simple and efficient since it is an extension of the identity-based aggregate signature scheme due to Gentry and Ramzan. Though the identity-based aggregate signature scheme of Gentry and Ramzan is secure in the random oracle model, in this paper, we find that the identity-based proxy multi-signature scheme of Wang and Cao is not secure unless each proxy secret key can only be used to generate at most one proxy signature. Finally, we propose an improvement to overcome this weakness, which is more simple and efficient than the identity-based proxy multi-signature scheme of Wang and Cao. We show that the improvement is existentially unforgettable in the random oracle model under the computational Diffie-Hellman assumption.