Identity-based directed proxy ring signature scheme

摘要

Proxy ring signature scheme allows a proxy signer to sign messages on behalf of the original signer while providing anonymity. In these schemes any verifier can verify the proxy signature and he can be sure that the message is indeed given out by the proxy signer group, on the other hand, nobody can figure out who the proxy signer is. If the signed message is sensitive to the signature receiver, the ordinary proxyring signature schemes seems to be not suitable. To meet this requirement, in this paper, we proposed an ID-based directed proxy ring signature scheme by combining the functionalities of directed signatures and proxy ring signature scheme. This scheme is very useful in some applications where the anonymously leaking information is sensitive to the signature receiver. We have discussed the security requirements of the proposed scheme.