A security architecture for computational grids
CCS '98 Proceedings of the 5th ACM conference on Computer and communications security
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)
A Practical (t, n) Threshold Proxy Signature Scheme Based on the RSA Cryptosystem
IEEE Transactions on Knowledge and Data Engineering
Eliptic Curve Based Threshold Proxy Signature Scheme with Known Signers
Fundamenta Informaticae
Security Analysis of the Pomykala-Barabasz Scheme
Fundamenta Informaticae
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
Distributed provers with applications to undeniable signatures
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
On the security of some nonrepudiable threshold proxy signature schemes
ISPEC'05 Proceedings of the First international conference on Information Security Practice and Experience
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In 2006, Pomykala and Barabasz proposed an elliptic curve based threshold proxy signature scheme with known signers. They claimed that their scheme was relatively simple in construction, had the properties of unforgeability and non-repudiation, and admitted the proactive security. Later, Li and Hu pointed out that the scheme of Pomykala and Barabasz was insecure against the conspiracy attack. And then, they proposed an improved scheme. In this paper, we not only show that the threshold proxy signature scheme of Pomykala and Barabasz is universal forgeable, but also show that the improvement of Li and Hu suffers from the rogue key attack.