基于字符特征与同义词替换结合的文本隐写方法

Text Steganography Based on Character Features and Synonym Replacement

同义词替换等修改式隐写算法需要修改原始文本,容易因用词上下文不匹配而被识别,生成法等无载体隐写因受限于自然语言理解技术还无法完全实现语句上下文通顺。从均衡安全性和可用性的角度出发,在传统同义词替换方法的基础上,提出一种利用字符基本特征与同义词替换相结合的文本隐藏方法,将秘密信息的二进制位用字符特征表示,把秘密信息的位置信息通过同义词替换标识。实验结果表明,该方法具有较好的可实现性,同时通过对字符特征的选择和改变可有效实现隐写安全性,并具有灵活性且在隐蔽性方面有一定的改进,可以与即时通信结合,设计的对话拥有较大的隐藏容量。

Steganography by modification such as synonym substitution modifies the original text,so it is easy to be discovered because of the contextual mismatch.However,the coverless steganography,for example steganography by generation,cannot make the sentence fluent,because it is limited by the natural language comprehension technology.In order to balance the security and usability,a text steganography method based on the combination of character features and synonym replacement was proposed.The binary string of the secret is represented by the characters＇ features,and the location information is represented by the synonym substitution.It is showed that this method is easy to be implement,and security of this steganography method can be enhanced by the transformations of character features.Furthermore,this method is flexible and makes better in its capacity of concealment.The method designs a high capacity scheme,which can be combined with instant messaging.