【摘要】 由于传统的文本加密算法对图像加密的适用性不强，经典的Logistic映射存在系统参数范围受限、混沌序列分布不均等问题。通过一种基于循环移位结合改进型Logistic映射和Tent映射的图像加密算法。设置改进型Logistic映射和Tent映射的初始值和控制参数，并应用比特重拍技术提升过渡态中的混沌效果，达到提升图像加密算法的效果。明文图像进行处理时，先对其进行Arnold变换和异或的预加密处理，并对图像进行分块处理，然后利用Tent映射产生的序列进行排序索引与循环移位。在加密过程中明文图像经历了像素替换和像素扩散，使得明文像素的值和位置都发生了变化。实验结果表明，该算法具有良好的加密性能和安全性。更多还原

【Abstract】 Traditional text encryption algorithm is not applicable to image encryption, so classical Logistic map has limited range of system parameters and unequal distribution of chaotic sequences. In this paper, an image encryption algorithm based on cyclic shift combined with improved Logistic and Tent map is proposed. The initial values and control parameters of improved Logistic and Tent map were set, and the bitt retake technology was applied to improve the chaos effect in the transition state, so as to improve the effect of image encryption algorithm. When the plaintext image was processed, Arnold transform and XOR pre-encryption were carried out first, and the image was partitioned. Then, the sequence generated by Tent map was used for sorting index and circular shift. In the process of encryption, the plaintext image underwent pixel replacement and pixel diffusion,so that the value and position of the plaintext pixel were changed. Experimental results show that this algorithm has good encryption performance and security.更多还原