General Secure ID-Based Proxy Signature Scheme with Multi-Delegation

Proxy multi-signature allows two or more than two original signers delegate their signing capabilities to the same designated proxy signer respectively and then the proxy signer can create a signature on behalf of them. In this paper the proposed proxy signature scheme has the same function as proxy multi-signature scheme, but based on a different mechanism which is introduced into the proxy signature model by Hu et al in 2007 and improved by Tsai et al. The proposed scheme improves the proxy key generation protocol and make it more secure, and at the same time the proposed scheme has the merits of strong proxy signature and its proxy signature key has the forward security like Tasi´s.