A Priori knowledge based secure payload estimation |
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Authors: | Sai Ma Xianfeng Zhao Qingxiao Guan Zhoujun Xu Yi Ma |
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Affiliation: | 1.State Key Laboratory of Information Security, Institute of Information Engineering,Chinese Academy of Sciences,Beijing,China;2.School of Cyber Security,University of Chinese Academy of Sciences,Beijing,China;3.Beijing Information Technology Institute,Beijing,China |
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Abstract: | Many contemporary steganographic schemes aim to embed fixed-length secret message in the cover while minimizing the stego distortion. However, in some cases, the secret message sender requires to embed a variable-length secret payload within his expected stego security. This kind of problem is named as secure payload estimation (SPE). In this paper, we propose a practical SPE approach for individual cover. The stego security metric we adopt here is the detection error rate of steganalyzer (P E ). Our method is based on a priori knowledge functions, which are two kinds of functions to be determined before the estimation. The first function is the relation function of detection error rate and stego distortion (P E ? D function). The second function reflects the relationship between stego distortion and payload rate (D ? α) of the chosen cover. The P E ? D is the general knowledge, which is calculated from image library. On the other hand, D ? α is for specific cover, which is needed to be determined on site. The estimating procedure is as follows: firstly, the sender solves the distortion D under his expected P E via P E ? D, and then calculates the corresponding secure payload α via D ? α of the cover. For on-site operations, the most time-consuming part is calculating D ? α function for cover image, which costs 1 time of STC coding. Besides this, the rest on-site operations are solving single-variable formulas, which can be easily tackled. Our approach is an efficient and practical solution for SPE problem. |
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