一种基于位运算的图像加密算法

提出了一种新的基于位运算的图像加密算法 ,对数字图像进行加密和解密操作。利用非线性动力学系统的特性 ,结合 L ogistic映射和位运算中的异或操作设计了提出的算法。首先由输入的密钥和 L ogistic映射生成混沌序列 ,把得到的混沌序列经过适当处理后得到辅助数据序列 ,用此序列对图像数据逐字节进行异或操作得到加密图像 ;解密算法是加密算法的逆过程。实验结果表明提出的算法能够得到令人满意的结果。最后总结了算法的特点

An image-encrypting algorithm based on bit operation

In this paper, a new method for digital image encryption is proposed. Combined with the Logistic mapping in non|linear dynamics systems and the XOR operation, the proposed algorithm is designed. Firstly, a chaotic sequence is created using the Logistic mapping with the input key. An assistant data sequence is obtained after the chaotic sequence is properly processed. With this data sequence, the image data are processed byte by byte with the XOR operation. Then an encrypted image is resulted. The decrypting operation is the reverse process of encryption. The experimental results indicate that the proposed algorithm can get satisfying effect. Finally, the characteristics of the algorithm are summarized.