A simple forward secure blind signature scheme based on master keys and blind signatures

The forward secure property is important in digital signature schemes. Many schemes have been proposed for the forward secure signature. Among them, only a few have been proposed for the forward secure blind signature. The blind signature is, however, a critical technique in e-business and other applications and, thus, more research should be devoted on it. This paper focuses on the design of forward secure blind signature schemes. Digital signature schemes have been proposed and discussed for years. Some of them are efficient and secure. Even specific computing hardware is designed for these schemes. Our idea is, therefore, to combine two existing schemes, Koyama´s master key scheme and Chaum´s blind signature scheme, so that a forward secure blind signature scheme results. This proposed scheme is also fully examined for the forward secure property and the blind signing property. Since these two schemes are both based on the RSA cryptosystem, the security of the proposed scheme depends on the difficulty of solving the factoring problem.