Certificateless Group Oriented Signature Secure Against Key Replacement Attack

Since Al-Riyami and Paterson presented certificateless cryptography,many certificateless schemes have been proposed for differentpurposes. In this paper, we present a certificateless group orientedsignature scheme based on bilinear pairing. In our scheme, only themembers in the same group with the signer can independently verifythe signature. We prove the signature scheme is emph{existentialunforgeability} under adaptive chosen message attack in randomoracle model.