中文摘要：

采用一般同义词替换方法嵌入秘密信息时，需要对载体文本做较多修改，使得改写率较高，秘密信息的安全性降低．针对该缺点，设计了一种矩阵编码与同义词替换结合的信息隐藏方法，此方法首先按照一定规则编码将载体同义词数值化．然后利用矩阵编码可以降低载体改写率，根据待嵌入的秘密信息，对载体同义词分组进行矩阵编码来实现信息的嵌入．实验结果表明，采用基于矩阵编码的同义词替换隐写方法有利于提高嵌入效率，降低隐写文本被统计分析检测到的可能性，从而提高秘密信息的安全性．

英文摘要：

Embedding secret information using general synonym substitution-based method would result in low security as it makes a lot of modifications on a carder text. A new steganography algorithm combining matrix coding with synonym substitution was pro- posed to deal with this drawback. The proposed algorithm first quantifies cover synonyms according to the certain rules, and then the general synonym substitution-based method was improved by taking advantage of the characteristic of the matrix coding to reduce the rate of modification in a text. On the basis of secret information, matrix coding was applied to the grouping synonyms in the cover text to realize embedding process. Experimental results show that this algorithm can improve embedding efficiency by reducing the possibil- ity of stego texts to be detected by statistical analysis,also guarantee the security of secret information.