A short non-delegatable strong designated verifier signature |
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Authors: | Haibo Tian Jin Li |
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Affiliation: | 1. School of Information Science and Technology, Sun Yat-Sen University, Guangzhou 510275, China2. School of Computer Science, Guangzhou University, Guangzhou 510006, China |
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Abstract: | A non-delegatable strong designated verifier signature (NSDVS) enforces verification of a signature by a designated verifier only. The concept is useful in various commercial cryptographic applications such as copyright protection, e-voting, and e-libraries. This paper reports the shortest NSDVS so far that consists of only two elements. The scheme is inspired by an identification scheme and Cramer et al.’s OR-proof technique where a prover can prove that he knows at least one out two secrets. It is solidified by a symmetric key based group to group encryption algorithm. Two implementations of the algorithm are reported. The scheme is provably secure with respect to its properties of unforgeability, non-transferability, privacy of signer’s identity, and non-delegatability. |
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Keywords: | designated verifier signature non-delegatability symmetric encryption |
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