| 基于词性标记文法的文本信息隐藏算法 |
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| 引用本文： | 戴祖旭,洪帆.基于词性标记文法的文本信息隐藏算法[J].四川大学学报(工程科学版),2007(Z1). |
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| 作者姓名： | 戴祖旭 洪帆 |
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| 作者单位： | 武汉工程大学理学院 华中科技大学计算机科学与技术学院 湖北武汉430074华中科技大学计算机科学与技术学院.湖北武汉 湖北武汉 |
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| 基金项目： | 湖北省自然科学基金资助项目(2005ABA243) |
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| 摘 要： | 提出了以词性标记文法语言为变换域的文本信息隐藏方法。根据自然语言语法规则构造自由上下文文法,文法的句子是用词性标记符表示的句型;利用模拟函数将秘密信息变换为文法的句子;载体文本用分词与词性标记软件也变换为同一文法的句子;运用字符串匹配技术计算秘密信息句子在载体文本中的位置,位置即为密钥;接收方根据密钥提取文法的句子,再通过语法分析读出秘密信息;给出了信息隐藏容量公式。该算法不改变载体文本,能较好地解决Wayner的载体文本生成技术面临的载体文本合语法但不合语义的问题。
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| 关 键 词： | 文本信息隐藏 词性标记 自由上下文文法 模拟函数 |
Text Information Hiding Algorithm Based on Part of Speech Tag Grammar |
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| DAI Zu-xu.Text Information Hiding Algorithm Based on Part of Speech Tag Grammar[J].Journal of Sichuan University (Engineering Science Edition),2007(Z1). |
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| Authors: | DAI Zu-xu |
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| Abstract: | A method for text information hiding based on word tag language is proposed.The Content Free Grammar (CFG)is constructed according to natural language rules,and CFG language is pattern of natural language sen- tence.Both secretary messages and cover text are transformed into language of CFG,the position of a secretary message sentence appearing in the cover text is found by string matching,the position is a key.With the help of the key,receivers can find out the sentences that carry secretary messages easily,and read the secretary messages through syntactic analysis.Further more,a formula for computing the capacity of hidden information is given.This method does not require to modify cover text,meanwhile,it is a sound solution for cover text which produced by Wayner's scheme which is syntactic but not semantic. |
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| Keywords: | text information hiding part of speech tag content free grammar mimic function |
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