ISSN 1000-1239 CN 11-1777/TP

计算机研究与发展 ›› 2014, Vol. 51 ›› Issue (8): 1739-1747.doi: 10.7544/issn1000-1239.2014.20121213

• 信息安全 • 上一篇    下一篇

基于像素链动态失真和校验格码的±1隐写编码

包震坤1,2,张卫明1,3,程 森1,2,赵险峰4,5   

  1. 1(信息工程大学四院 郑州 450002);2(数学工程与先进计算国家重点实验室(信息工程大学) 郑州 450002);3(中国科学技术大学信息科学技术学院 合肥 230026) ;4(中国科学院信息工程所 北京 100093);5(信息安全国家重点实验室(中国科学院信息工程研究所) 北京 100093) (bao252547116@sina.com)
  • 出版日期: 2014-08-15
  • 基金资助: 
    基金项目:国家自然科学基金项目(60803155,61170234);中国科学院战略性先导科技专项课题(XDA06030601)

±1 Steganographic Codes by Applying Syndrome-Trellis Codes to Dynamic Distortion Model in Pixel Chain

Bao Zhenkun1,2, Zhang Weiming1,3, Cheng Sen1,2, Zhao Xianfeng4,5   

  1. 1(The Fourth Institute, Information Engineering University, Zhengzhou 450002);2(State Key Laboratory of Mathematical Engineering and Advanced Computing (Information Engineering University), Zhengzhou 450002);3(School of Information Science and Technology, University of Science and Technology of China, Hefei 230026);4(Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100093);5(State Key Laboratory of Information Security (Instituteof Information Engineering, Chinese Academy of Sciences), Beijing 100093)
  • Online: 2014-08-15

摘要: 双层校验格码(syndrome trellis code, STC)是目前最小化±1隐写失真的流行工具,但是该方法是概率算法,可能造成嵌入失败,并且计算复杂度较高.因此提出像素链动态失真模型,利用当前像素的SLSB(second least significant bit)位控制下一像素的LSB(least significant bit)位,使得嵌入过程中有些像素的失真可以动态调整为零.进而,将STC码应用于动态失真模型,得到了一种新的±1隐写编码方法.新方法最小化失真的能力与双层STC接近,嵌入速度明显优于双层STC.并且新方法是确定性算法,可以保证嵌入成功,所以更适合在实际的应用系统中使用.

关键词: 信息隐藏, 隐写编码, 双层嵌入, 像素链, 校验格码

Abstract: Double-layered STC (syndrome trellis code) is the most popular method for minimizing the distortion of ±1 steganography. However, it is a probabilistic algorithm which may fail in the embedding process on some given profiles. Another characteristic of double-layered STC is the high computational complexity. Starting from these two points, we propose a dynamic distortion model defined in a pixel chain in this paper. The dynamic distortion model is working on a principle that the SLSB (second least significant bit) of current pixel is used to control the LSB (least significant bit) of the next pixel. So the distortion of some pixels may be adjusted to zero by this means. We apply STC to fit the dynamic distortion model and get a novel method for ±1 steganography. Comparing with the double-layered STC, the experiment result shows that the proposed method has comparable ability for minimizing distortion with significantly improved embedding speed. And this novel method avoids failure in the embedding process. Considering the advantages together, the method is more suitable for steganography systems and software in practical environment.

Key words: information hiding, steganographic codes, double-layered embedding, pixel chain, syndrome trellis codes

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