New multisignature scheme for specified group of verifiers

摘要

While in ordinary digital signature scheme one signer is sufficient to sign a message and one verifier is sufficient to check the validity of a given signature, there are situations in which a group of signers cooperatively sign a message and a group of verifiers cooperatively check the validity of a given signature. So far, only two multisignature schemes for specified group of verifiers have been suggested. Recently, He pointed out that the two schemes do not satisfy their security requirements. In this paper, the authors present a new multisignature scheme for specified group of verifiers. Forging signatures in the proposed scheme is equivalent to forging Harn's signatures. The proposed scheme can withstand He's attack.