基于Android的QR码安全防伪技术及应用

发布时间：2018-03-26 05:51

本文选题：二维码　切入点：数字水印　出处：《中南林业科技大学》2015年硕士论文

【摘要】：QR码具有纠错能力强、容量大、易于识别等优点,是条码家族优秀的一员,且应用最为广泛。但是,由于QR码也是采用公开的编码模式,缺少严格意义上的防伪方法,使它在保密性方面略显不足。数字水印技术利用了视觉冗余将秘密信息隐藏在数字媒体中,而使人们无法感知信息嵌入后媒体数据的差异。因此,结合数字水印技术和二维条码技术,能够很大程度上的提升二维条码在防伪方面的应用。二维条码和水印结合主要有两种方法,根据结合方式的不同可以生成条码水印或水印条码。条码水印是将二维条码作为水印然后嵌入到载体中,其主要利用二维条码纠错性能好、译码能力强的特点。水印条码即以文本或者图像作为水印信息,经过处理后嵌入二维码中。本文针对二维条码在实际应用中存在的安全问题,分析了QR码的优势以及其在应用中存在的问题,深入剖析了QR码的结构以及编码解码流程,设计了一种变换域QR码水印。该方法结合离散小波变换与奇异值分解将水印信息嵌入到QR码中,并采用混沌加密、信息隐藏等技术得到水印条码。实验结果表明,本文提出的水印算法在不影响QR码正确识别的前提下,具有良好的安全性和鲁棒性。最后,结合本文提出的QR码水印算法,设计了一套基于QR码的防伪系统,并将其应用在物流防伪子系统中。通过需求分析、数据库设计、环境搭建,到手机客户端与后台服务器端的设计,最终实现对物流信息的管理与调度,保证物流信息的准确性和安全性。
[Abstract]:QR codes have the advantages of strong error-correcting ability, large capacity, easy recognition and so on. QR codes are excellent members of bar code family and are widely used. However, because QR codes are also used in public coding mode, there is a lack of anti-counterfeiting methods in strict sense. Digital watermarking technology makes use of visual redundancy to hide secret information in digital media, which makes people unable to perceive the difference of media data after information is embedded. The combination of digital watermarking technology and two-dimensional bar code technology can greatly enhance the application of two-dimensional bar code in anti-counterfeiting. Barcode watermark or watermark bar code can be generated according to the different combination mode. Bar code watermarking is to use two-dimensional bar code as watermark and then embed it into carrier, which mainly uses two-dimensional bar code to correct errors. The watermark bar code, which takes text or image as watermark information, is embedded into two-dimensional code after processing. This paper aims at the security problems of two-dimensional bar code in practical application. This paper analyzes the advantages of QR code and the problems in its application, and deeply analyzes the structure of QR code and the process of encoding and decoding. In this paper, a transform domain QR code watermark is designed, which combines discrete wavelet transform and singular value decomposition to embed watermark information into QR code. Chaotic encryption and information hiding techniques are used to obtain the watermark bar code. The proposed watermarking algorithm has good security and robustness without affecting the correct recognition of QR code. Finally, a set of anti-counterfeiting system based on QR code is designed by combining the proposed watermarking algorithm of QR code in this paper. Through requirement analysis, database design, environment construction, to the design of mobile phone client and background server, the management and scheduling of logistics information is realized. Ensure the accuracy and safety of logistics information.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP391.44;TP309.7

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