一种高效的彩色图像加密和解密算法

分析了基于Amold变换的加密方案在加密效果及加密效率方面的不足。提出了一种新的彩色图像加密及解密算法。加密过程将像素的物理位置置乱并映射到不同的色彩空间；解密过程提出了一种针对彩色图像的逆变换算法，使解密的时间仅依赖加密的密钥而不依赖变换周期。仿真分析比较了该算法在加密效果及加密效率方面的优势。实验数据表明，该加密算法的加密效果理想，且加密效率较高，是一种简单、可行的彩色图像加密方法。

Efficient Encryption and Decryption Algorithm for Color Image

The deficiencies of encryption scheme based on Arnold transformation is analyzed, and a new encryption/decryption algorithm for color image proposed. The physical locations of pixels are scrambled and mapped to different color spaces in the encryption process. An inverse conversion method for color im- age is suggested in decryption process, thus making the decryption time dependent only on the encryption key instead of on the conversion cycle. Simulation and comparison of the advantages of proposed algorithm in encryption effect and encryption efficiency indicates that the proposed algorithm could improve encryp- tion effect while raising the decryption efficiency, and thus a simple and feasible color image encryption method.