Designated Confirmer Proxy Signature Scheme

In this paper, we propose a designated confirmer proxy signature scheme which combines the designated confirmer signature and the proxy signature. In the proposed scheme, an original signer delegates his/her signing capability to a proxy signer, and the proxy signer generates a signature on behalf of the original signer. To verify a signature, the proxy signer or the confirmer designated by the original signer should be involved in the verification step. We also discuss the security properties of the proposed scheme.