ID-Based Multi-Proxy Signature and Blind Multisignature from Bilinear Pairings

Multi-proxy signature allows the original signer delegate his singing power to a group of proxy signers. Blind proxy-signature allows the user to obtain a signature of a message from several signers in a way that each signer learns neither the message nor the resulting signature. Plenty of multi-proxy signature and blind multisignature schemes have been proposed under the certificate-based (CA-based) public key systems. In this paper, we firstly propose an identity-based (IDbased) multi-proxy signature scheme and an ID-based blind multisignature scheme from bilinear pairings. Since there seems no ID-based threshold signature schemes up to now, both the proposed schemes can be regarded as a special case of corresponding variants of ID-based threshold signature.