基于记忆特性的LSB密写  

LSB Steganography Base on Memory Characteristic

作　　者：易云[1] 周定康[1] 李智彪[1] 

机构地区：[1]江西师范大学计算机信息工程学院,南昌330022

出　　处：《科技广场》2006年第7期27-29,共3页Science Mosaic

摘　　要：LSB密写技术是目前一种应用最为广泛的数据隐藏技术。本文通过对LSB密写算法的分析,指出了对载体图像进行LSB密写会引起图像统计特性改变的原因,并在此基础上提出了一种基于记忆特性的LSB密写算法。该算法记录下载体已经进行密写部分的统计特性,如果被嵌入的秘密比特与原始像素值的最低位相同,就不作改动;否则就根据该统计特性进行增1或减1的调整;在接收方,提取信息时只需要将载体图像的最低比特位提取、解密即可恢复秘密信息。该算法具有较高的隐蔽性,能够有效地抵抗统计分析方法。Steganography is an important part of Information Hiding. This paper analyses LSB Steganography arithmetic, points out the reason for the change of picture＇ s statistical characteristic after using LSB Steganography arithmetic. This arithmetic records the statistical characteristic of the part of picture writing secret information. If the secret byte is equal to the host pixel＇s last byte, then do nothing. Otherwise, the host pixel＇ s last byte will be changed from i to i＋1 or from i to i-1 according to the statistical characteristic. Extraction of the embedded information can still be accomplished by extracting the LSB plane 1 as in the straight LSB method. This arithmetic has high quality of information hiding and can effectively resist the statistical analyse.

关 键 词：数字密写 密写分析 加密 记忆特性 信息隐藏 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]