A Forward-Secure Blind Signature Scheme

Forward security and blind signature become hot spots in the researches of cryptography. Forward-secure digital signature can effectively reduce the loss that aroused for the reason of secret keys exposure. Blind signature plays an important role in protecting the senders´ privacy. This paper proposes a new conception named correlative-factor, and by which a forward-secure blind signature scheme based on ElGamal is designed. Forward security is applied to a blind signature scheme in this paper. Through the detailed analysis of security, the proposed scheme not only has the features of forward-secure, weak blindness and resisting forging attack, but also has certain theory and practical values.