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This paper analyzed the security of a blind signature scheme and showed that it was insecure against the public key replacement attack in certificateless cryptosystems, the adversary could replace the users' public key to forge the signature and presented the forgery attack method. Based on this attack and combined with the constructor of blind signature and the selection methods of blind factor, this paper gave an improved scheme and analyzed the blindness, unlinkability, non-forgery and efficiency The results show that the new scheme is more secure and efficient. [ABSTRACT FROM AUTHOR]

Through the cryptanalysis of a proxy blind signature scheme based on DLP proposed by He Jun-jie, this paper found that this scheme can cause the public replacement attack. To avoid these attacks, this paper proposed a new improved scheme. Analysis result shows that the new improved scheme can resist the original signer's public key replacement attack. It satisfies all the security requirements of proxy blind signature based on the DLP problems and improve the computation efficiency. [ABSTRACT FROM AUTHOR]