CAJ | 학술논문

文章提出了一种利用离散余弦变换（DCT）和混沌系统相结合的图像加密算法，首先利用DCT将图像在频率域压缩，然后利用混沌系统分别生成置换规则和混沌符号序列对压缩后的数据在频率域加密。通过仿真实验表明，文章所提出的算法，在取得良好的加密效果同时，还具有一定的压缩性能，并且可以根据需要对压缩性能和加密效果进行适当的调整。
문장제출료일충이용리산여현변환（DCT）화혼돈계통상결합적도상가밀산법，수선이용DCT장도상재빈솔역압축，연후이용혼돈계통분별생성치환규칙화혼돈부호서렬대압축후적수거재빈솔역가밀。통과방진실험표명，문장소제출적산법，재취득량호적가밀효과동시，환구유일정적압축성능，병차가이근거수요대압축성능화가밀효과진행괄당적조정。
This paper puts forward a kind of image encryption algorithm based on the discrete cosine transform(DCT )and chaotic system .firstly ,the DCT is used to compress image in frequency domain ,then replacement rule and chaotic sequence of symbols was generated respectively by using chaotic system to en‐crypt the compressed data in the frequency domain ,Simulation results show that the proposed algorithm can not only make good encryption effects ,but has the certain compression performance .At the same time , the algorithm can make the appropriate adjustments to the compression and encryption effect according to the need .