Design And Implementation Of Security Copying System Based On 2D Bar Code-QR Code

As the rapid development of computer technology and Internet, we are at the information age. Computer and network not only changed our lives truly, but also bring new challenge for work of keep document secrecy traditionally. Military, government and research institutions need to keep the confidential document in security. While the main method of managing document is enforcing security management system nowadays, especially paper document is basically managed by manual registration and audit, which leak important information and cause various security problems at the step of printing. So how to keep the document security is a big problem that needs to be solved.According to the above problem of safety supervision, the main innovation of this paper is to design a security copying system based on two-dimensional QR code which is inserted in the system. It can also verify electronic document, control document's limits of authority and trace electronic document to ensure the security of the document by extracting a large number of watermark information (including document and copy information). The main part of the paper list below:Firstly, the paper introduces security copying, the classification and the characteristics of 2D bar code, and the application status at home and abroad. We explain the background of the system and key technologies, such as the principle of printing, its impact for the image, information hiding, digital watermark, and 2D bar code QR code.Secondly, the paper designs an security copying system based on QR code by combing QR codes and digital watermark. The scheme inserts QR code as digital watermark to document. It can store huge information and fight print scan attack effectively as QR code character of huge information capacity, vast encoding rage, strong sectary, better error correction and wide location. Meanwhile, it can also verify electronic document, control document's limits of authority and trace electronic document to keep document security.Thirdly, the secrity copying system includes three subsystems:the subsystems with embedding watermark, the subsystem seal with controlling copying and the subsystem with audit and configuration management and the audit and configuration management. They can embed watermark, safely scan and print documents, and deal with audit and trace in the process of document copy respectively. The functional structure of the various subsystems and the implementation of the main function are introduced in the paper.Fourthly, after the design and the implementation have been finished, this paper shows the system interface and the document inserted by QR code watermark. Besides, the work carried out is summarized and the future of the work is elaborated.