A proxy fail-stop signature scheme with proxy revocation

In this paper, we propose a new type digital signature, proxy fail-stop signature scheme with proxy revocation. In the proposed scheme, the proxy signer can sign a message on behalf of the original signer and provide a proof of forgery if it occurs. Moreover, the original signer can revoke the signing rights from the proxy signer. The proposed scheme is based on two hard problems, discrete logarithm problem and factorization. We define the security requirements for the proxy fail-stop signature with revocation and show that our scheme satisfies all security requirements.