New Efficient Proxy Blind Signature Scheme Using Verifiable Self-certified Public Key

Proxy blind signature, which combines the properties of both proxy signature and blind signature, is useful in e-cash and e-commerce. In this paper, we present a verifiable self-certified public key scheme and a proxy blind signature scheme using the verifiable self-certified public key. The self-certified public key has an advantage which can withstand public key substitution attacks. As far as we know, this is the first scheme that satisfies the security properties of both the proxy blind signature and verifiable self-certified public key. Another advantage is that the proposed verifiable self-certified public key scheme overcomes the weakness of repudiability of the self-certified public key. Analysis shows that our scheme are secure and efficient.