Mobile agents are able to migrate across different execution environments through network. However, proxy signature is a signature that an original signer delegates his signing capability to a proxy signer. If a mobile agent may act as a proxy signer to produce signatures on behalf of the agent owner autonomously on remote hosts, this will increase efficiency of the agent owner. In this work we propose a novel and secure non-designated proxy signature scheme with revocation. This work is different from other related proxy signature scheme in that in addition to providing non-repudiation, the method provides the proxy signer's privacy which be realized by Alias Issuing authority, if need be, the proxy signer's privacy can be revoked, and a prominent character is that Alias Issuing authority is untrusty, even though he colluded with the original signer, they also cannot forge a proxy signature. These features are attractive for proxy signature in agent-based paradigm in which proxy signers are mobile agents that are executed in remote untrustworthy host.
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