Title

On the Security of the Lee-Hwang Group-Oriented Undeniable Signature Schemes

Publication Type

Conference Proceeding Article

Publication Date

9-2004

Abstract

Undeniable signature is an intriguing concept introduced by Chaum and van Antwerpen at Crypto89. In 1999, Lee and Hwang presented two group-oriented undeniable signature schemes with a trusted center. Their schemes are natural generalizations of Chaums zero knowledge undeniable signature scheme proposed in 1990. However, we find that the Lee-Hwang schemes are insecure. In this paper, we demonstrate five effective attacks on their schemes: four of them are insider universal forgeries, in which one dishonest member (maybe colluding with a verifier) can get a valid signature on any chosen massage, and another attack allows a dishonest member to prevent honest members from generating valid signatures. We also suggest heuristic improvements to overcome some of the problems involved in these attacks.

Discipline

Information Security

Research Areas

Information Security and Trust

Publication

Trust and Privacy in Digital Business: First International Conference, TrustBus 2004, Zaragoza, Spain, August 30 - September 1: Proceedings

Volume

3184

First Page

289

Last Page

298

ISBN

9783540300793

Identifier

10.1007/978-3-540-30079-3_30

Publisher

Springer Verlag

City or Country

Zaragoza, Spain

Additional URL

http://dx.doi.org/10.1007/978-3-540-30079-3_30