基于离散数字混沌序列的图像加密

由幅值连续的Logistic混沌公式研究了一种幅度值离散数字混沌序列的产生方法,可方便用于硬件实现图像加密.采用函数运算方法由3个不同周期的离散数字混沌序列"异或"运算获得长周期图像加密序列,将图像加密序列与原始图像"异或"加密图像.加密和解密仿真对比可见,该方法对初始值具有敏感性.分析表明,所获得的幅度离散数字混沌序列产生方法具有算法简单,信息安全可靠性高,便于硬件实现的特点.

Image Encryption through Discrete Digital Chaotic Sequence

Study a new formula for amplitude discrete chaotic sequence to encrypt images under hardware devices conveniently from Logistic mapping formula for continuous amplitude, and generate a longer period sequences by exclusive OR algorithm with three amplitude discrete digital chaotic sequence in different periods, The image is encrypted by exclusive OR algorithm with the longer period image encrypting sequence and original image. The method is sensitive to initial values through simulation of encrypting and decrypting image. The result shows that the manner to generate amplitude discrete chaotic sequence is simple and more secure for information security, more convenient for hardware to encrypt images.