DCT变换与DNA运算相结合的图像压缩加密算法

为了解决图像加密后数据量大、传输速率慢的问题,采用了离散余弦变换(DCT)与脱氧核糖核酸(DNA)运算相结合的图像压缩加密方法.首先采用DCT对原始图像进行压缩;再进行DNA编码;最后根据DNA运算的思想,通过Chen混沌系统对原始图像执行DNA加法运算,成功得到了加密图像.结果表明,该算法不仅有效地提高图像传输速度、减少存储空间,同时加密效果好、安全性高.

Image compression-encryption algorithm combined DCT transform with DNA operation

In order to solve the problems of huge amount of data and slow transmission speed after image encryption, a new image compression encryption algorithm combined discrete cosine transform (DCT) with deoxyribonucleic acid (DNA) operation was presented. At first, the original image was compressed by means of DCT and encoded according to DNA sequence. Finally, based on DNA operation, DNA addition operation was implemented to the original image by Chen chaotic system and an encrypted image was obtained. Simulation results show that the algorithm not only improves the speed of image transmission and reduces the storage space, but also has good encryption effect and high security.