Designated-receiver proxy signature scheme for electronic commerce

Proxy signature is the solution to delegation of signing capabilities in electronic world. Proxy signatures are signature schemes that an original signer delegates his signing capability to a proxy signer, and the proxy signer creates signatures on behalf of the original signer. To avoid the misuse of proxy signatures, the original signer hopes that he can restrict the signing capability delegated to the proxy signers. In this paper, a designated-receiver proxy signature scheme is proposed. In this scheme, an original signer nominates a person as signature receiver when he delegates his signing capability to a proxy signer, and the proxy signer can generate valid proxy signature on behalf of the original signer which none but the nominated receiver can verify and accept, thus the misuse of proxy signature is avoided. The security of the proposed signature scheme is analyzed. The scheme will be applied in e/spl I.bar/commerce and other fields.