Repairing ElGamal-Like Multi-Signature Schemes Using Self-Certified Public Keys

[[abstract]]Recently, Chang et al. proposed an ElGamal-like multi-signature scheme using self-certified public keys. Being inspired of the insider attack, an insider attack is proposed on their scheme to show that a malicious member in the signing group can forge a valid multi-signature without the other members secrete keys. To remove this attack, an improved multi-signature is also proposed.[[sponsorship]]教育部; 國家科學委員會; 東華大學[[notice]]補正完畢[[conferencetype]]國際[[conferencedate]]20021218~20021221[[booktype]]紙本[[iscallforpapers]]Y[[conferencelocation]]花蓮縣, 臺