Analysis and improvement of identity-based designated verifier signature scheme

Li Mingxiang et al proposed identity based strong designated verifier signature schemes are analyzed, it is found that the scheme of security vulnerabilities: non designated verifier can verify the validity of the signature, and the scheme does not have the unforgeability. Based on the above shortcomings, proposed the improvement scheme. While retaining the merits of the original scheme overcomes the original scheme security hidden trouble. Improved scheme satisfies transitivity, unforgeability, signer identity anonymity and other safety features, and has higher efficiency of signature.