Research On Information Hiding Algorithm For Electronic Certificate

The traditional electronic license sharing deposit scheme ignores the problem that the electronic license is not authorized to be used in the process of circulation and the problem that the license can not be traced after being leaked and maliciously damaged.A verifiable and traceable electronic license sharing deposit scheme is urgently needed to provide security for the sharing and retention of electronic licenses.Reversible information hiding technology can restore the original carrier medium without loss,which is conducive to the realization of tripartite verifiability in the process of electronic license transfer.The robust watermarking algorithm has strong anti-attack ability and traceability,which is conducive to the efficient traceability of the leakage source.In view of this,the reversible information hiding technology and robust watermarking suitable for electronic licenses are studied,and these two information hiding algorithms are applied to the electronic license sharing deposit scheme,which provides strong supporting for the real authorized use of electronic licenses and provides a strong guarantee for the leakage and traceability of electronic licenses.Specific contributions are as follows:(1)Aiming at the problem that the traditional reversible information hiding algorithm has poor concealment and cannot verify the authenticity of the source of the license,a verifiable reversible information hiding algorithm for electronic license is proposed.Firstly,a smooth metric strategy for highlighting texture is designed by making full use of the correlation between adjacent pixels.At the same time,an adaptive texture dynamic estimator is constructed to dynamically predict pixels based on texture.Secondly,the embedding order of the algorithm is optimized,and the image is embedded in four rounds,so as to reduce the influence of abrupt texture on the accuracy of pixel prediction.Finally,combined with digital signatures,the authenticity of the license source can be verified.Theoretical and experimental analysis show that the proposed algorithm can effectively verify the authenticity of the license source,and has better concealment than similar algorithms,which provides strong supporting for the credible verification of electronic licenses.(2)Aiming at the problem of non-authentic authorized use of electronic licenses and the inability to trace after leakage,a verifiable and traceable electronic license sharing deposit scheme is proposed.Firstly,according to the practical application requirements of electronic licenses,a model of electronic license sharing deposit system is proposed.Secondly,aiming at the problem of watermark information loss in the traditional strong robust watermarking algorithm,the existing strong robust watermarking algorithm is improved based on BCH code,so as to realize the error correction of watermark information distortion.Then,in order to achieve tripartite verifiability and efficient traceability after the leakage of electronic licenses,a verifiable and traceable electronic license model is constructed by combining the proposed verifiable reversible information hiding algorithm for electronic licenses and the error-correctable robust watermarking algorithm.On this basis,an electronic license sharing deposit protocol is designed to ensure the real authorized use of licenses and efficient traceability after leakage.Finally,through security and efficiency analysis,it is shown that the scheme can achieve efficient traceability after licenses disclosure and has good anti-collusion attack detection ability under the premise of ensuring the verifiability of the three parties.