• 安全漏洞 - 引用次数：5

  But now multi-effective stegananalysis against them have already come forth. In order to improve steganographic security, according to these steganographic algorithms existing stastical abnormality and the corresponding steganalysis, this thesis proposes steganographic algorithms that can effectively resist statistical analysis , so have better security, the main achievement of this thesis as follows:(1) According to the security flaw in Bit-plane complexity segmentation(BPCS) steganography, i. e. two striking discontinuities in the complexity histogram unambiguously announce the presence of BPCS-based hidden information, this thesis proposed an improved algorithm, We set different threshold values at different bit planes, and construct a function to evaluate the block brightness, then combine region brightness where block locates and block complexity to select bit-plane blocks for embedding.

  为提高密写的安全性,本文在研究相应密写分析方法的基础上,针对密写算法中存在的统计异常,提出了能有效的抗统计分析、安全性能更好的密写算法,取得了以下主要成果:(1)针对位平面复杂度分割(BPCS)密写中存在的安全漏洞,即密写图像的位面小块复杂度直方图中存在的两个明显的不连续点暴露了秘密信息的存在,本文提出了一种改进算法,即通过在不同位平面设置不同的复杂度阈值,同时构造一个二次函数来衡量区域的明暗度,利用小块所处区域的明暗度和复杂度相结合来选择位面小块嵌入信息。

  参考来源 - 抗统计分析的图像密写技术研究
  保全缺陷

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