Proxy signatures for delegating signing operation
CCS '96 Proceedings of the 3rd ACM conference on Computer and communications security
On Zhang's Nonrepudiable Proxy Signature Schemes
ACISP '98 Proceedings of the Third Australasian Conference on Information Security and Privacy
ICICS '97 Proceedings of the First International Conference on Information and Communication Security
Efficient Group Signature Schemes for Large Groups (Extended Abstract)
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
On the efficiency of nonrepudiable threshold proxy signature scheme with known signers
Journal of Systems and Software
An efficient nonrepudiable threshold proxy signature scheme with known signers
Computer Communications
Provably secure multi-proxy signature scheme with revocation in the standard model
Computer Communications
A new proxy signature scheme for a specified group of verifiers
Information Sciences: an International Journal
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In 2004, Hwang and Chen demonstrated new multi-proxy multi-signature schemes that allow a group of authorized proxy signers to sign messages on behalf of a group of original signers. Later, Lyuu and Wu pointed out Hwang et al.'s schemes were not secure and then proposed a modified scheme. They claimed that their modified schemes were secure. But in this paper we show a new attack on the Lyuu-Wu et al.'s schemes. Moreover, the original Hwang-Chen's schemes are also vulnerable to this insider attack. Furthermore, we point out some improvements for the Lyuu-Wu scheme and Hwang-Chen schemes according to Wang et al.'s methods [Wang GL, Han XX, Zhu B. On the security of two threshold signature schemes with traceable signers. In: Applied Cryptography and Network Security (ACNS 2003). Lect Notes Comput Sci (LNCS), vol. 2846, Springer-Verlag; 2003. p. 111-222]. These improvements can resist our insider attack.