Certificateless Proxy Blind Signature Scheme from Bilinear Pairings

While Shamir’s identity-based public key cryptosystem does not need the certificates, the key escrow of user’s private keys is inherent in such scheme. In 2003,the concept of certificateless signature scheme was introduced. In this new paradigm, the necessity of certificates has been successfully removed and the key escrow problem does not exist. Based on the ideas of certificateless signatures and Boneh et al.’s Short Signature Scheme, a certificateless proxy blind signature scheme is proposed in this paper. Compared with the existed schemes, the new scheme has the properties of strong unforgeability and strong Non-repudiation.