Abstract:  In order to analyze and design secure signature schemes under the standard model, and avoid the similar security issues in designing signature schemes, a new certificateless signature scheme and a forward- secure certificate-based signature scheme in the standard model are analyzed. The results show that this signature scheme can suffer from public key replacement attack and backdoors attack, the attacker can generate a valid signature on any message. These attacks are analyzed concretely, the methods about how to overcome these attacks are discussed. These attack methods are reference significance for the analysis and design of similar signature.

Key words: standard model, backdoors attack, public key replacement attack, bilinear pairings, certificate-based,  certificateless