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中文摘要：
针对数字签名技术中签名信息易被移除的问题，在语义技术的基础上提出了基于语义水印的数字签名算法。该算法的基本思想是在不改变文本语义的前提下，通过同义词替换算法嵌入签名信息，并在数据加密阶段，综合运用DES算法和RSA算法，使得破解及窜改签名信息更加困难。实验证明，该算法具有容易实现、鲁棒性好、抗检测性强的优点。
英文摘要：
For the lack of removing signature information easily in the technology on digital signature, based on semantic watermarking technology, proposed the algorithm based on semantic watermarking. The basic idea of the algorithm was that, on the premise of not making any changes to the semantics of the text, embedded digital signature information through the algorithm of synonymy substitution. In addition, in the stage of data encryption, the comprehensive use of the DES algorithm and RSA algorithm make the cracking and tampering of signature information more difficult. Experiments testify that the algorithm itself is easy to realize, robust and strong anti-testing.
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