| 摘要: |
| 目前利用传统文本搜索式进行的无载体信息隐藏方法中，信息隐藏容量小,隐藏成功率低。为此，提出了一种基于部件直方图和随机文本选择的无载体信息隐藏方法。首先对文本数据库构建部件直方图，利用哈希算法生成文本标签作为文本索引，并根据给定的阈值随机选择一定量的文本对象作为载体文本集；然后对秘密信息进行转换，得到“部件+运算符”的组合，在载体文本集中检索包含有秘密信息的部件集合的载体文本，得到秘密信息索引；最后对文本索引和秘密信息索引进行哈夫曼编码(Huffman Coding)形成二进制序列，作为密钥索引发送给接收方，以实现秘密信息的隐藏。实验结果表明该算法隐藏成功率可达到 98.33%，证明了该方法的有效性。 |
| 关键词: 无载体信息隐藏 汉字数学表达式 部件直方图 随机文本选择 哈夫曼编码 |
| DOI： |
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| 基金项目:国家重点研发计划（2019YFE0122600） |
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| Coverless information hiding based on components histogram and random text selection |
| ZENG Di,HUANG Huajun |
| (1.College of Computer Science and Information Technology,Central South University of Forestry and Technology,Changsha 410018,China;2.School of Information Technology and Management,Hunan University of Finance and Economics,Changsha 410205,China) |
| Abstract: |
| In current coverless information hiding methods using traditional text search,small information hiding capacity and low hiding success rate are the main problems.For these reasons,a coverless information hiding method based on components histogram and random text selection is proposed.Firstly,for the text database the component histogram is constructed,the text label is generated as the text index by Hash algorithm,and then a certain amount of text objects is randomly selected as the carrier text set using the given threshold in the text database,and the secret message is converted into “components + operators” in the carrier text set,the carrier text of the component set containing the secret message is retrieved to obtain the secret message index.Finally,Huffman-coding for the text index and the secret message index is performed to form a binary sequence,which is sent to the receiver as the key index to realize the hiding of secret message.The experimental results show that the hiding success rate of the proposed algorithm can reach about 98.33%,which proves its effectiveness. |
| Key words: coverless information hiding Chinese character mathematical expression components histogram random text selection Huffman coding |
