Abstract:

Based on the Dai’s scheme, by the revision of proxy private key structure, and addition of the public key information of verifier in the proxy authorized certificate, it is proposed that a new digital signature scheme. The scheme has two properties: (1) Strong unforgetability, original signer cannot forge a signature signed by proxy signer; (2) Misuse, proxy signer cannot complete to verify and receive he/she make a designated receiver proxy signature, and use the signature for other usage. In the same time, Multiple receiver for a signature can be designated in our scheme, during making a designated receiver proxy signature, proxy signer need interact with receiver to complete the signature, and the signature can only be received this receiver. The new scheme has high controllability.

Key words: designated receiver proxy signature, multi-designated receiver, unforgeability, misuse, controllability