Analysis of a Group Digital Signature Scheme
Chun Liu · 2003
By analyzing the security of a Self-verified Public Key Scheme,we found out that the scheme has several problems: 1)anyone can fake a legal signature easily; 2)group members can forge the secret key easily; 3)if group members collude then they can recover the group secret key, consequently, they can sign on any message; 4)the real signer can be easily identified. And the remedy is put forward for the problems.