Abstract: Forward secure characteristic is effective on dealing with the key exposure problem, a forward secure proxy signature scheme based on certificateless public key cryptography is proposed. This new scheme is forward secure by updating secret key frequently. When the proxy signature secret key is stolen, the attacker can not forge the former proxy signature, and it can reduce the loss, which caused by the key exposure to a great extent. Analysis result shows that the new scheme can overcome the problem of the certificate management in the certificate-based public key cryptosystem and the inherent key escrow problem in the identity-based public key cryptosystem.
certificateless public key cryptography,