简捷安全的电子公文系统的设计与实现  

Design and implementation of concise and secure electronic document system

作　　者：卢辉斌[1] 国宪鹏[1] 郝敏[1] 张鹏[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《计算机工程与设计》2011年第6期1930-1933,1945,共5页Computer Engineering and Design

基　　金：河北省教育厅2007科研基金项目(2007493)

摘　　要：针对现有电子公文系统在安全性和效率方面的问题,提出了一种简捷安全的基于数字水印技术和混沌技术的电子公文系统。从预量化后的DCT系数中生成水印,利用logistic混沌系统进行迭代后,将其嵌入到置乱的两个DCT矩阵块组合的相同位置的系数中。该系统将logistic系统初始值作为密钥,没有密钥者将无法进行水印的嵌入和提取。实验结果表明,该系统对合法的JPEG压缩具有良好的鲁棒性,对其它攻击具有敏感性,能够有效地检测在传输中对公文图像的篡改和破坏。Aimed at the problems of the existing system in safety and efficiency, a concise and secure system for transmitting eleltronic document is offered based on digital watermarking and chaos technologies. Watermark is generated from the pre-quantized DCT coefficients and iterated using chaotic system and then embeded into the coefficients in the same location of the two scrambled DCT matrixes. As the initial value of logistic system is the only key of the system, people without it will be unable to embed or extract watermark. Experimental results show the system is robust against JPEG lossy compression in the legitimate limit and sensitive to other attacks, and can detect the tampers in the transmitting process of the document image effectively.

关 键 词：电子公文 数字水印 混沌系统 离散余弦变换 预量化系数 图像认证 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]