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

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±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

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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