Repudiation of Cheating and Non-repudiation of Zhang's Proxy Signature Schemes

Authors:
Hossein Ghodosi;Josef Pieprzyk
Affiliations:
-;-
Venue:
ACISP '99 Proceedings of the 4th Australasian Conference on Information Security and Privacy
Year:
1999

Citing 3
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Abstract

The paper discusses the correctness of Lee, Hwang and Wang's comments on on Zhang's proxy signature schemes. In particular, it is shown that the cheating attack proposed by Lee, Hwang and Wang can be detected by the owner of the signature scheme. It is argued that considering the context in which proxy signatures are used, the attack is not a security problem. The work is concluded by a discussion about the non-repudiation controversy incorrectly observed by Lee, Hwang and Wang.