The Security Flaw of an Untraceable Signature Scheme
Chin‐Chen Chang, Ya‐Fen Chang · Journal of the Association for Information Systems · 2004
In 2003, Hwang et al. proposed a new blind signature based on the RSA cryptosystem. The Extended Euclidean algorithm is employed in their proposed scheme. They claimed that the proposed scheme was untraceable and it could meet all requirements of a blind signature. However, we find that the signer can still trace the blind signature applicant in some cases. Thus, we present the security flaw of Hwang et al.’s scheme in this paper.