CAJ | 학술논문

分析当前流行的一类基于混沌序列置乱像素位置和像素值加密的混沌算法的安全性的不足，提出了一种抗选择明（密）文攻击的图像加密新算法。采用Kent混沌系统，根据明文像素值的特征和输入的密钥共同产生混沌系统的参数和预迭代次数，首先用混沌序列实现图像像素位置的全局置乱；其次，用另一个混沌序列实现对图像像素值中0、1比特位置乱。混沌序列的产生都与图像本身的内容自适应。仿真实验结果表明，该算法既克服了以往算法不能抵抗选择明（密）文攻击的缺陷，又具有良好的图像加密性能。
분석당전류행적일류기우혼돈서렬치란상소위치화상소치가밀적혼돈산법적안전성적불족，제출료일충항선택명（밀）문공격적도상가밀신산법。채용Kent혼돈계통，근거명문상소치적특정화수입적밀약공동산생혼돈계통적삼수화예질대차수，수선용혼돈서렬실현도상상소위치적전국치란；기차，용령일개혼돈서렬실현대도상상소치중0、1비특위치란。혼돈서렬적산생도여도상본신적내용자괄응。방진실험결과표명，해산법기극복료이왕산법불능저항선택명（밀）문공격적결함，우구유량호적도상가밀성능。
We analyze the safety of a chaotic encryption algorithm which is very popular nowadays,based on chaotic sequences scrambling pixel position and pixels encryption,and propose a new image encryption algorithm which is resistant to known-plain-text and chosen-plaintext attacks.The algorithm uses Kent chaotic system to produce the parameters of the chaotic system and the iteration times based on the features of plaintext pixel and input key.Firstly,the global position scrambling is achieved with the chaotic sequence image pixels.Second,the other chaotic sequence is used to scramble the 0,1 bit position of image pixels. Chaotic sequence is produced adapting to the image.Simulation results show that the algorithm is not only resistant to known-plaintext and chosen-plaintext attacks,but also has good image encryption performance.