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Meijiao Duan, Jing Xu and Dengguo Feng Efficient identity-based strong designated verifier signature schemes Security and Communication Networks 6

Article first published online: 26 NOV 2012 | DOI: 10.1002/sec.645

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In this paper, we show that the identity-based strong designated verifier signature (IBSDVS) scheme of Kang et al. is actually forgeable, delegatable, and not strong. We then propose an improved efficient IBSDVS scheme with short signature size and provide formal security proofs on the basis of the CDH assumption in the random oracle model. Our scheme outperforms all the existing IBSDVS schemes known in the literature. Furthermore, we propose an extended nondelegatable IBSDVS scheme achieving high efficiency and short signature size and provide formal security proofs.

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