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1、1000-9825/2004/15(01)0151©2004JournalofSoftware软件学报Vol.15,No.1*基于差分直方图实现LSB信息伪装的可靠检测+张涛,平西建(信息工程大学信息科学系,河南郑州450002)ReliableDetectionofSpatialLSBSteganographyBasedonDifferenceHistogram+ZHANGTao,PINGXi-Jian(DepartmentofInformationScience,UniversityofInforma
2、tionEngineering,Zhengzhou450002,China)+Correspondingauthor:Phn:+86-371-3531563,Fax:+86-371-3531563,E-mail:deltd@yahoo.com.cnReceived2002-10-14;Accepted2003-04-17ZhangT,PingXJ.ReliabledetectionofspatialLSBsteganographybasedondifferencehistogram.JournalofSo
3、ftware,2004,15(1):151~158.http://www.jos.org.cn/1000-9825/15/151.htmAbstract:Detectionofhiddenmessagesinimagesisofgreatimportanceforboththenetworkinformationsecurityandtheimprovementofsecurityofsteganographicalgorithms.Basedonthestatisticalobservationsont
4、hedifferencehistogramofimages,anewsteganalytictechniquecapableofareliabledetectionofthespatialLSB(leastsignificantbit)steganographyisproposed.TranslationcoefficientsbetweenthedifferencehistogramsaredefinedasameasureoftheweakcorrelationbetweentheLSBplanean
5、dtheremainedbitplanes,andthenusedtoconstructaclassifiertodiscriminatethestego-imagefromthecarrier-image.ThealgorithmcannotonlydetecttheexistenceofhiddenmessagesembeddedusingLSBreplacementinimagesreliably,butalsoestimatetheamountofhiddenmessagesexactly.Ith
6、asadistinctphysicalmeaningandcanbeimplementedconveniently.Experimentalresultsshowthatforrawlosslesslystoredimages,thenewalgorithmhasabetterperformancethantheRS(regularsingular)steganalysismethodandimprovesthecomputationspeedsignificantly.Thenewapproachisa
7、lsoapplicableforcolorimages.Keywords:informationhiding;steganography;steganalysis;LSB(leastsignificantbit);differencehistogram;regularsingularsteganalysis摘要:在信息伪装技术研究中,图像中隐藏信息的检测对于保障网络信息安全和提高信息伪装算法的安全性具有重要意义.基于对图像差分直方图的统计观察,提出了一种新的可靠检测空域LSB(leastsignifica
8、ntbit,最不重要比特位)信息伪装的方法.定义差分直方图间的转移系数作为LSB平面与图像其余比特平面之间的弱相关性度量,并在此基础上构造区分载密图像和载体图像的分类器.这一算法不仅可以高度可靠地确定图像中通过空域LSB替换方法嵌入的秘密信息的存在性,还可以准确估计图像中嵌入的秘密信息数据量的大小.算法物理意义直观,实现简单,计算量小.实验结果表明,针对原始无损存储图像可以获得优于RS(regularsingular)隐写分析
