基于混沌的数字信息置乱方法及应用

Chaotic-based digital information disorder and its application

利用cat-混沌映射,对数字信息进行位置置乱;在此基础上,将混合光学双稳模型作为混沌源,以特定的初值作为秘钥,生成一组二进制混沌序列,与数字信息特定的二进制位进行异或运算,实现数字信息的加密。对加密信息进行逆运算,便能将信息还原。由于混沌序列对初值极为敏感,初值微小的改变都会产生完全不同的序列,从而保证了置乱过程的惟一性和不可破译性。可根据实际需要只对隐秘数据二进制的高位进行异或操作,在保证信息置乱效果的同时,提高算法的运行效率。该方法可直接应用于数字水印的生成、数据加密、解密及信息隐藏等。提出三种方案,对数字图像的置乱实验结果表明了算法的有效性。

In this paper. A cat chaotic mapping is used firstly to disorder the coordinate of the information. Based on this, using the arithematic of chaotic model, we obtain a chaotic binary sequence which will be performed exclusive or operation with certain binary bits of the digital information. Thereby we obtain the encrypted message. In order to restore the information, the disordered information should be performed inverse exclusive or operation and inverse cat mapping. For the chaotic random sequence is sensitive to the initial value, which guarantees the uniqueness and unbreakable of the disordering process. The technique which we put forward can be applied directly on digital watermark＇s making, data encryption techniques, information＇s hiding and so on. In the end we put forward three schemes, the experiment results regarding digital image prove the efficiency of the method.