Security Anti-fake Technology And Application For QR Code Based On Android

QR code is equipped with advantages of correction capability, large capacity As an excellent member of the code family, QR code is widely used because of its good error correction capability, large capacity, good recognition ability and other advantages. However, the public coding mode of QR code is lack of strict security and anti-fake method, which makes it insufficient in terms of confidentiality. Digital watermarking technology hides secret information in digital media by the use of visual redundancy and makes people unable to perceive the difference of the information-embedded media data. Therefore,the combination of the digital watermark technology and two-dimensional bar code technology can largely enhance the security of two-dimensional bar code application.There are two combination dimensional methods of the two-dimensional bar code and the watermark bar code, which can generate barcode watermark or watermark bar code according to different combination forms. In the barcode watermark, two-dimensional barcode is embedded into the carrier as watermark, which mainly utilizes the good error correction performance and the strong decoding ability of the two-dimensional bar code. In the watermark bar code, the text or image is embedded in the two-dimensional code as watermark information after the treatment.Aiming at the security problems exist in the practical application of 2D barcode, the advantages and problems in application of QR code along with the structure of QR code and the encoding and decoding process are analyzed in this paper. Afterward, a kind of transform domain QR watermark algorithm is designed. The watermark information is embedded into the QR code by the combination of discrete wavelet transform and singular value decomposition, and the chaotic encryption, information hiding technology are also utilized in the method. The experimental results show that the proposed watermarking algorithm has good security and robustness in the premise of not affecting the correct recognition of the QR code.Finally, combined with the proposed QR codes watermarking algorithm, a security system based on the QR code is designed. The system is utilized in the logistics security. From the demand analysis, database design, environment design to the design of the mobile phone client and server side, the final realization of the management and scheduling of logistics information ensures the accuracy and safety of logistics information.