差异聚类和误差纹理合成的生成式信息隐藏  

Generation information hiding method combining difference clustering and error texture synthesis

作　　者：李国利 邵利平[1] 任平安[1] Li Guoli;Shao Liping;Ren Ping'an(School of Computer Science,Shaanxi Normal University,Xi'an 710119,China)

机构地区：[1]陕西师范大学计算机科学学院

出　　处：《中国图象图形学报》2019年第12期2126-2148,共23页Journal of Image and Graphics

基　　金：国家自然科学基金项目(61100239);陕西省自然科学基金项目(2011JQ8009,2016JM6065);中央高校基本科研业务费支持项目(GK201402036,GK201703057)~~

摘　　要：目的搜索式无载体信息隐藏容量小、搜索量大,涉及大量载体密集传输;纹理构造式隐藏只能生成简单非自然纹理;纹理合成式隐藏存在固定映射以及编码、非编码小块的明显区别特征,且未考虑样本小块差异度和遭受攻击时的类别提取错误,抵抗攻击能力十分有限。针对以上问题,提出一种差异聚类和误差纹理合成的生成式信息隐藏。方法在嵌入时,通过差异均值聚类获取编码样本小块,结合多重映射将代表秘密信息的编码样本小块随机放置在空白图像上,按最小误差优先拼接策略生成含密纹理。在提取时,通过密钥截取样本小块,寻找最接近编码样本小块,并结合秘密信息MD5(message-digest algorithm 5)值和随机坐标来恢复秘密信息。结果所提方法与MD5值和密钥紧密绑定,密钥参数、MD5值以及样例图的改变都将导致秘密信息的提取误码率趋近于0.5。同现有方法相比,结合最小误差优先拼接策略,所提方法的像素累计差异更小,含密纹理视觉质量较好且对密钥极度敏感,以实验样本为例,当遭受质量因子为50~70的JPEG压缩和5%~15%的椒盐噪声攻击时,秘密信息可完整提取。即使遭受25%~40%的椒盐噪声攻击,提取误码率低于7%。结论所提方法避免了固定映射和编码、非编码小块的区别特征,含密掩体视觉质量较好且具有较强的抗攻击能力。Objective Two typical methods of coverless information hiding are currently available. One is search-based coverless information hiding, which transmits secret information by querying a text or image containing secret information from a database, and the other is texture generation-based information hiding,which relays secret information by generating a stego texture similar to a given image texture. Search-based information hiding has a small embedding capacity and a large search space and involves the intensive transmission of numerous carriers. Although every isolated text or image in this method is a normal text or image without modification, the method is still suspicious because of the dense transmission of carriers. Texture generation-based information hiding can be further divided into texture construction and texture synthesis-based information hiding. Generating a real natural texture directly is challenging. In texture synthesis-based information hiding, apparent distinguishing features between coded and non-coded blocks and a fixed mapping relationship between secret information and coded blocks exist. The method has low security and disregards the difference degree among various coded blocks and category errors during attacks. To address these problems, this work proposes a generation information hiding method that combines difference clustering and minimum error texture synthesis. Method First, in the embedding process, sample blocks are randomly captured in the sample texture image by a key. Then, the mean square errors of the kernel regions between the sample blocks and the random key template are calculated. These errors are divided into several categories through a difference mean clustering strategy, in which the sample block closest to the cluster center position is selected as the coded sample block in each category. Second, a multiple mapping relationship is established to obtain the coded sample block number through secret information decimal numbers, the MD5(message-digest algorithm 5) val

关 键 词：差异聚类 纹理生成 信息隐藏 最小误差 图像缝合 样例纹理合成 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]