采用混沌系统的HIS彩色图像加密算法

为了增强对数字彩色图像信息安全的有效保护,给出一种基于医院信息系统(HIS)的彩色图像加密算法.首先,使用混沌序列控制对亮度层的位平面排序;然后,对排序后每一个位平面采用改进的置乱算法;最后,恢复到像素平面以完成加密.该算法相比于基于RGB系统的加密算法,减小了时间复杂度,且不降低加密算法的安全性能.仿真结果表明:该算法的密钥空间大、秘钥敏感性强,对统计分析和剪切攻击具有较好的抵抗能力.

HIS Color Image Encryption Algorithm Using Chaos System

In order to protect digital color image’s safety, one color image encryption algorithm for hospital information system(HIS)space is proposed in this paper. First of all, use chaotic sequence to control the bit-plane of luminance layer, then use the improved scrambling algorithm on each sorted bit-plane, finally, retrieve them into pixel plane. This algorithm has less time complexity compared to the traditional algorithm in RGB space, meanwhile, has good safety performance. The simulating results show that this algorithm has a large space of keys, good key sensitivity, also has ability to resist the statistical analysis and shearing attacks.