CAJ | 학술논문

针对目前图像加密算法复杂性较高的问题，提出了一种新的小波域分块加密算法。该算法先将原始图像用小波函数进行多分辨率分解，并将分解后的低频系数进行分组，应用超混沌系统产生的加密模板，对分组的低频小波系数进行分块置乱；小波逆变换后，应用超混沌系统产生的伪随机系列与图像异或运算，实现了图像的加密变换。实验结果证明，加密后的图像已隐藏原始图像的灰度信息，且密钥空间大，安全性能高；此算法加密置乱后的图像具有良好抵抗统计攻击及差分攻击能力。
침대목전도상가밀산법복잡성교고적문제，제출료일충신적소파역분괴가밀산법。해산법선장원시도상용소파함수진행다분변솔분해，병장분해후적저빈계수진행분조，응용초혼돈계통산생적가밀모판，대분조적저빈소파계수진행분괴치란；소파역변환후，응용초혼돈계통산생적위수궤계렬여도상이혹운산，실현료도상적가밀변환。실험결과증명，가밀후적도상이은장원시도상적회도신식，차밀약공간대，안전성능고；차산법가밀치란후적도상구유량호저항통계공격급차분공격능력。
Aiming at the problem of high complexity of image encryption algorithm at present,a new wave-let domain block encryption method was proposed.First,the algorithm decomposed the original image into multiple different resolution images using DWT(discrete wavelet transform),and the low-frequency coeffi-cients of the image were scrambled by the hyperchaotic system.After IDWT(inverse discrete wavelet trans-form),bitwise XOR was performed on the reconstructured image with a sequence generated using hyper-chaostic system.The experimental results verified that the grey information of the original image was hid-den,this encrypting method had a large space of keys and high safety performance;and the scrambled im-age had good performance of the resisting statistic attack and differential cryptanalysis.