CAJ | 학술논문

基于变参数的复合混沌系统，提出了一种图像加密新算法．首先，根据一维Logistic映射选择自身的系统参数，并结合三维混沌系统，构造一种非线性耦合函数来对明文进行置乱．其次，根据明文信息和混沌序列，对每一次置乱后的像素点进行像素灰度变换．这样，算法便具有密码学所需的置乱、随机等特性．仿真实验和安全性分析表明，该加密算法加密效果良好，密钥空间较大，并有良好的统计特性，可以有效地抵御穷举攻击、差分攻击以及选择明文攻击等．
기우변삼수적복합혼돈계통，제출료일충도상가밀신산법．수선，근거일유Logistic영사선택자신적계통삼수，병결합삼유혼돈계통，구조일충비선성우합함수래대명문진행치란．기차，근거명문신식화혼돈서렬，대매일차치란후적상소점진행상소회도변환．저양，산법편구유밀마학소수적치란、수궤등특성．방진실험화안전성분석표명，해가밀산법가밀효과량호，밀약공간교대，병유량호적통계특성，가이유효지저어궁거공격、차분공격이급선택명문공격등．
Based on compound chaotic systems with variable control parameters, a novel image encryption scheme is proposed. Firstly, the system parameter of the Logistic map is chosen according to the map itself and a nonlinear coupled function is constructed with a 3D chaotic system to scramble the pixels of the plain- text. At the same time, gray-level transformation is operated after each round of scrambling according to the chaotic sequences and plaintext. Hence, the proposed algorithm owns the characteristics necessary for crypto- system such as confusion and diffusion, etc. Simulation experiments and the security analysis indicate that the proposed scheme has a large key space together with excellent statistical properties, and can resist exhaustive attack, differential attack and ehosen-plaintext attack, etc.