A zero-knowledge proof scheme of possessing a RSA digital signature

Abstract

Zero-knowledge proof schemes of possessing a RSA digital signature are proposed. The schemes give a new method of preventing arbitrary propagation of digital signature. By which the prover does not need to give directly the signature of the message, but to give a zero-knowledge proof of possessing a digital signature. The schemes are the improvement of confirm signature, and is much simpler in practice and of significant feature that it does not need the third party to take part in the scheme. The schemes can be used in copyright protection.