Research And Realization Of Traceability Electronic Document Protection System Based On Digital Watermarking

Along with the continuous promotion of information construction in variousindustries, it has become increasingly prominent security issues about confidentialelectronic documents. Currently, traditional security technologies cannot meet thedemand for protecting confidential electronic documents in the internal network. Onceconfidential electronic documents are divulged, it is difficult for traditional technicalmeans to trace the original users and judge the responsibilities, thus the problem ofdivulgence by insiders cannot be solved effectively by traditional technical means. So itis of realistic significance to research the security mechanism of traceability electronicdocument protection.After researching the existing technology of text digital watermarking, in view ofthe demand of leakage tracing, an adaptive text watermarking algorithm based on thefont color of character has been proposed. In the algorithm, the font color feature ofcharacter is utilized to embed watermarking based on quadratic residue theory. Andaccording to the total number of characters in the text, the ring number of embedding isselected adaptively. The experiment results indicate that the method has the strongerwatermarking robustness and better concealment.According to the above text watermarking algorithm, a prototype of traceabilityelectronic document protection system has been designed and implemented in this paper.In the prototype, mark of user’s identity information is generated by the fingerprintrecognition technology. Then this mark is embedded into the confidential electronicdocument as a basis to trace the origin of illegal leakage. And combining withtraditional cryptography technology, it uses secure data exchange platform which isprovided by PKI to ensure authenticity of user’s identity and secure transmission ofconfidential electronic documents. The experiment results demonstrate that thisprototype can accurately trace leaker. And the controllability of confidential electronicdocuments is enhanced effectively.