一种图像置乱加密新算法

A New Algorithm for Digital Image Scrambling

提出了一种实用的数字图像置乱新算法。该算法利用线性同余模型产生伪随机序列以对图像进行空间置乱,采用异或操作实现图像的灰度变换。该算法密钥可变,变化数较多,且灰度直方图改变,难以穷举破解。同时解密算法容易求得,解密过程与加密周期无关,从而大大缩短了解密时间。实验结果表明,该算法具有较好的抗攻击和抗干扰能力,并且易于实现,是一种理想的图像置乱方法。

This paper presents a useful new algorithm of digital image scrambling. It achieves space clmos of an inrage with a pscudo-random sequence generated by linear congruential method, and achieves gray chaos by XOR operation. This algorithm＇s secret keys are different to each other, and they are in many types, and the histogram is also different to the original image＇s histogram , so it＇s difficult to creck the encrypted image by exhaustive method. On the oilier hand, the decryption method is easy to obtain, and the dectyption process is irrelative with the encryption cycle, so it shortens the time consuming of decryption greatly. The results of experiment indicate that, this algorithm plays a good performance in anti-attack and anfi-jamming , and what＇ s more, it＇ s easy to be realized, so it is an ideal method for image scrambling.