混沌掩码融合频谱分割拼接的多图像一次同步加密机制研究  

The Study on One-encryption Mechanism for Multiple Images Based on the Chaotic Masks with Spectrum Segmentation Joint

作　　者：高彦卿[1] 

机构地区：[1]南阳理工学院软件学院,南阳473004

出　　处：《科学技术与工程》2014年第23期245-251,256,共8页Science Technology and Engineering

摘　　要：为了解决当前多图像加密机制存在串扰效应以及密文失真等难题,提出了混沌掩码融合频谱分割拼接的多图像并行加密机制。引入频谱切割拼接技术,将多个明文压缩成一个混合频谱图像,以压缩数据量,提高运行效率。设计率失真控制优化技术,嵌入到频谱切割拼接机制中,优化失真值,控制图像压缩,减少失真度;再利用2D Logistic混沌映射对混合频谱进行置乱;结合混沌相位掩码,构造混沌变换函数,对置乱频谱进行双重加密。仿真实验结果表明:加密机制高度安全;密文频谱分布均匀,且具有优异的加密质量与强烈的密钥敏感性能,密文与明文间的均方误差非常高,而信噪比很低;且密文解密质量优异,有效消除了串扰效应。In order to overcome these defects such as crosstalk effects and rate distortion in current multi-image encryption mechanism; the multi-images parallel encryption algorithm was proposed based on coupled chaotic masks with spectrum segmentation joint. Multiple plaintexts were pressed into one mixed spectrum image by introducing the spectrum segmentation joint technology to reduce the amount of data and improve operation efficiency; the designed technology of rate distortion control was embedded into spectrum segmentation joint to optimize the distortion value for controlling the image compressing. Then 2D logistic map was used to permutate the mixed spectrum. The chaotic transformation function was constructed by the chaos phase mask to double encrypt the permutation spectrum. Simulation results were showed that this encryption mechanism was highly secure with excellent quality and strong key sensitivity, the spectrum of cipher-text was distributed uniformly ; and the mean square error between the cipbertext and the plaintext was very high, and signal to noise ratio was very low; as well as the decryption image with good quality to effectivelv eliminate the crosstalk effects.

关 键 词：多图像加密 串扰效应 频谱切割拼接 混合频谱 率失真控制 

分 类 号：N391.41[自然科学总论]