摘要
Abstract
In order to improve the security of image encryption algorithm,we presented a new colour hyperchaotic mapping-based image encryption algorithm.First,the colour image is decomposed into three channels of R,G and B respectively.Secondly,four chaotic sequences generated by Chen's hyperchaotic system are used to scramble the pixel locations of each channel.Thirdly,every channel is carried out the bit-plane displacements and bitwise negation by taking the four chaotic sequences as the basic condition for disturbing the pixel values.At last,the encrypted colour image is derived from recombining the bit-planes and three colour channels R,G and B.Simulation and security analysis all show that our image encryption algorithm has good encryption effect,bigger key space,higher key sensitivity,and can resist the exhaustive attack and statistic attack.关键词
图像加密/超混沌/位平面置换/按位取反/安全性Key words
Image encryption / Hyper-chaos / Bit-plane displacement / Bitwise negation / Security分类
信息技术与安全科学
