Improvement of self-certified public key signature scheme
Zhixiong Chen · Journal of Computer Applications · 2009
The efficient self-certified public key signature scheme proposed by Zhang Xuejun was analyzed and the defects in security was pointed out, because Certification Authority (CA) also has the capacity of generating self-certified public key signature on any message, causing the verifier unable to make sure whether the signature is generated by the signer himself. Similarly, the signer has good reason to deny the signature, therefore, the signature losses its undeniability. Finally, based on the discrete logarithm problem, an improved signature scheme was proposed and its efficiency was the same as the former one. However, taking prior operation into consideration, the efficiency of the improved scheme was higher than the original scheme.