A Digital Image Encryption Algorithm Based on Improved ZigZag Transformation and Chaotic Sequence
炽 冯 · Computer Science and Application · 2017
针对数字信息在传输过程中易被窃取的现象，本文提出了一种基于改进的ZigZag变换与混沌序列相结合的数字图像加密算法。首先对原始图像进行改进ZigZag置乱变换，然后利用混沌序列对图像的每一个像素进行位运算，得到加密后的图像。解密正是加密的反过程。通过理论分析与实验验证，新算法能够使加密后的图像灰度分布均匀，具有更大的密钥空间，并且对密钥具有更高的敏感性。 For the phenomenon that digital information is easily stolen during transmission, we purpose a digital image encryption algorithm based on improved ZigZag transformation and chaotic se-quence. Firstly, the original image is transformed with the improved ZigZag method. Then each bit of the image is bit-computed using the chaotic sequence. Decryption is the reverse of encryption. According to the theoretical analysis and experimental verification, the encrypted image has a uniform gray distribution. Besides, the new algorithm has a large key space, and has a high sensitivity to the keys.