脆弱性数字水印在电子票据防篡改中的应用研究

摘要

随着Internet技术的不断成熟，电子商务的应用不断普及，其活动过程中各种电子票据的完整性保护倍受关注。在详细分析和研究了数字水印，特别是脆弱性水印算法、特征和应用领域的基础上，提出一种基于偶校验和最低有效位的脆弱性水印算法，该算法简单清晰，易于编程实现。实验结果表明该算法在不影响宿主图像视觉质量基础上，可精确地检测和定位对图像内容的局部恶意篡改，具有很强的敏感性、稳健性，同时该算法很容易推广到其他数字媒体。%With growing maturity of the Internet technology,the application of electronic commerce is continuously popularising,in its activity process,the integrity protection of various electronic bills attracts much attention.In this paper we elaborately analyse and study the algorithm,characteristics and application fields of digital watermarking,in particular the fragile watermarking.On that basis,a fragile watermarking algorithm based on even parity and the least significant bit is proposed.The algorithm is simple and clear,easy to programming and implementing.Experimental results show that the algorithm can accurately detect and locate the local malicious tampering on image content without affecting the visual quality of the host image,it has the very strong sensitivity and robustness,and can be easily generalised to other digital media.