Certificateless partially blind signatures

Partially blind signature is a variant of blind signature. It allows a signer to explicitly include common information in a blind signature under some agreement with a receiver. It provides anonymity of users in applications such as electronic voting and electronic payment systems. While certificateless public key cryptography eliminates the key escrow problem in identity public key cryptography. In this paper, we introduce the concept of partially blind signature into certificateless public key cryptography. The security model of certificateless partially blind signature scheme is defined. A certificateless partially blind signature scheme is presented as well. The scheme is proven existentially unforgeable against adaptive chosen-message attacks under the computational Diffie-Hellman assumption.