基于STC码和分频段嵌入的JPEG隐写技术研究  

Study on JPEG steganography based on syndrome-trellis codes and multi-band embedding

作　　者：梅雪[1] 刘渊[1] 吴昊天[1] MEI Xue;LIU Yuan;WU Haotian(School of Digital Media, Jiangnan University, Wuxi, Jiangsu 214122, China)

机构地区：[1]江南大学数字媒体学院,江苏无锡214122

出　　处：《计算机工程与应用》2016年第20期118-121,199,共5页Computer Engineering and Applications

基　　金：国家自然基金青年基金(No.61100169);中央高校基本科研业务费专项资金项目(No.JUSRP1047)

摘　　要：针对JPEG图像提出了一种基于STC(Syndrome-Trellis codes)编码和分频段嵌入的信息隐藏技术。STC编码是一种二元隐写码,可以用来提高嵌入效率,增强数字隐写系统的安全性。在所提算法中,将离散余弦变换系数(DCT系数)分为六个频段,包括直流、低频、中低频、中频、中高频和高频,与STC编码相结合在不同频段设置不同的嵌入率,通过调节各频段的编码系数,在高频段取得最高的嵌入效率和最低的数据嵌入率,并逐步增加在中高频、直流、中频、中低频和低频段的嵌入率,提高算法的安全性。为了评估所提算法的抗检测性,采用四种隐写分析算法进行测试分析。四种隐写分析算法的检测结果表明,所提算法在多种JPEG图像质量因子下的安全性优于文献中多种隐写算法。In this paper, a new JPEG image steganographic algorithm is proposed based on Syndrome-Trellis Codes(STC)and multi-band embedding. Syndrome trellis codes can directly improve the security of many existing steganographic systemsby improving the embedding efficiency. In the proposed algorithm, the DCT coefficients are divided into six frequencybands, including the Direct Current(DC), low, middle-low, middle, middle-high and high frequencies. With STC, thehighest embedding efficiency is achieved in high frequency band with the lowest hiding rate, while the hiding rate is graduallyincreased in the middle-high, DC, middle, middle-low and low frequency bands so that the hidden message is madeless detectable. The proposed algorithm is implemented and tested by using four JPEG steganalytic algorithms. The numericalresults show that the secret messages hidden by the proposed algorithm are less detectable than several algorithms in theliterature for the JPEG images at different levels of quality.

关 键 词：联合图像专家小组(JPEG)隐写 分频段嵌入 STC编码 隐写分析 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]