Abstract
A digital multisignature is a digital signature of a message generated by multiple signers with knowledge of multiple private keys. In this paper, an efficient RSA multisignature scheme based on Shamir's identity-based signature (IBS) scheme is proposed. To the best of our knowledge, this is the first efficient RSA-based multisignature scheme with both fixed length and the verification time. The proposed identity-based multisignature scheme is secure against forgerability under chosen-message attack. It is also secure against multi-signer collusion attack and adaptive chosen-ID attack.
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