长春理工大学学报(自然科学版)
長春理工大學學報(自然科學版)
장춘리공대학학보(자연과학판)
JOURNAL OF CHANGCHUN UNIVERSITY OF SCIENCE AND TECHNOLOGY(NATURAL SCIENCE EDITION)
2014年
4期
117-120
,共4页
混沌%Hash函数%置乱%扩散%图像加密
混沌%Hash函數%置亂%擴散%圖像加密
혼돈%Hash함수%치란%확산%도상가밀
chaos%Hash function%scrambling%diffusion%image encryption
为了实现对数字图像的加密,提出了一种基于混沌理论和Hash函数的自适应图像加密算法。该算法用抽取的Lorenz混沌信号及Hash函数得到像素置乱矩阵,并对图像的像素进行置乱,利用分段Logistic映射对图像灰度进行自适应扩散。理论分析和仿真实验结果表明,该算法具有密钥空间大、抗统计攻击能力强、有效抵抗熵攻击、秘钥敏感性强等良好的性能,能够达到相应的安全水平。
為瞭實現對數字圖像的加密,提齣瞭一種基于混沌理論和Hash函數的自適應圖像加密算法。該算法用抽取的Lorenz混沌信號及Hash函數得到像素置亂矩陣,併對圖像的像素進行置亂,利用分段Logistic映射對圖像灰度進行自適應擴散。理論分析和倣真實驗結果錶明,該算法具有密鑰空間大、抗統計攻擊能力彊、有效牴抗熵攻擊、祕鑰敏感性彊等良好的性能,能夠達到相應的安全水平。
위료실현대수자도상적가밀,제출료일충기우혼돈이론화Hash함수적자괄응도상가밀산법。해산법용추취적Lorenz혼돈신호급Hash함수득도상소치란구진,병대도상적상소진행치란,이용분단Logistic영사대도상회도진행자괄응확산。이론분석화방진실험결과표명,해산법구유밀약공간대、항통계공격능력강、유효저항적공격、비약민감성강등량호적성능,능구체도상응적안전수평。
In this paper, a image encryption algorithm based on chaos theory and Hash functions are proposed for achive the digital image encryption. The scrambling transformation pixel matrix of image is got from extraction chaotic signal and Hash function by using the algorithm,then the adaptive diffusion for image gray scale is carried out by using piecewise Logistic mapping. This algorithm has large key space;the statistical attack capability is strong and effective against entropy attack;secret key sensitivity is strong,good performance;the corresponding security level can be met.