Provably secure proxy blind signature scheme

A proxy blind signature scheme is a digital signature scheme which combines the properties of a proxy signature and a blind signature scheme. Recently, Guilin Wang proposed a provably secure proxy signature scheme, which is based on a two-party Schnorr signature scheme. In this paper, on the basis of Guilin Wang's proxy signature scheme and the Okamoto-Schnorr blind signature, we propose a provably secure proxy blind signature scheme against adaptive chosen message attack on random oracle model. And proposed scheme satisfies the security properties of both the blind signature and the proxy signature scheme.