A Smart Card-based Authentication System for Undeniable Digital Signature

摘要

In this paper, we proposes a smart card-based authentication system for undeniable digital signature. Our system consists of two parts, and each part is based on ElGamal cryptosystem and Chaum-van Antwerpen undeniable digital signature scheme. Each system is modified to take into smart cards. Our scheme does not require a password table for verifying the legitimacy of the login users. And, attempts to repudiate or deny a valid signature can be prevented or detected more certainly. Accordingly, we can control users' access to sensitive resource and settle up disputes over forgeries by our scheme. In addition to, our scheme totally withstand with message replaying attack.