基于移位变换的句子层自然语言信息隐藏算法

Algorithm of natural language information hiding based on shift conversion in sentence level

针对现有的句子层自然语言信息隐藏方法存在的问题,提出一种基于句子层移位变换规则的中文自然语言信息隐藏算法.首先利用汉字数学表达式对中文文本信号数字化;然后通过句子的移位变换改变句子词序以嵌入秘密信息.实验结果和分析表明,该算法实现简单、编码容量较大,同时秘密信息隐藏在自然语言文本句子层词序变换中,不改变文本语法、语义和风格,具有较好的隐蔽性.

An algorithm based on shift conversion is proposed combining with the characteristic of Chinese grammar. A method based on chinese mathematical expression is presented by converting Chinese text into bit string. Then, shift conversion rules are selected by utilizing transform grammar based on case grammar that Chinese philologist proposed. The secret information is embedded by modifying the order of words in the sentence according to the shift conversion rules. The experimental results show that the method can achieve a degree of information-carrying capacity and a better result with the imperceptibility.