CAJ | 학술논문

混沌作为一种复杂的非线性运动行为，具有遍历性、初值敏感性、宽频谱以及类随机性等特征，这些特征使混沌同密码学紧密联系起来。本文提出了一个基于Chen混沌系统的图像压缩加密算法。对原始图像经过预处理后进行离散余弦变换和熵编码，实现对图像的压缩，利用Chen混沌系统生成伪随机密钥流序列，将其用于对图像像素进行置乱和替代操作以完成对图像像素的加密。测试与分析结果表明所提出的算法具有良好的性能。
혼돈작위일충복잡적비선성운동행위，구유편력성、초치민감성、관빈보이급류수궤성등특정，저사특정사혼돈동밀마학긴밀련계기래。본문제출료일개기우Chen혼돈계통적도상압축가밀산법。대원시도상경과예처리후진행리산여현변환화적편마，실현대도상적압축，이용Chen혼돈계통생성위수궤밀약류서렬，장기용우대도상상소진행치란화체대조작이완성대도상상소적가밀。측시여분석결과표명소제출적산법구유량호적성능。
Chaos is a kind of complex nonlinear motion. It has many typical properties such as ergodicity,sensitivity to ini-tial conditions,broad spectrum,and random-like behaviors. So chaos is connected with cryptography closely. A Chen chaotic mapping based image compression and encryption algorithm is proposed in the paper. The original image is pretrea-ted and then the image data are compressed by the discrete cosine transform and the entropy coding. The pseudorandom key-stream sequences generated by the Chen mapping are used to scramble and diffuse the image pixels and get the cipher image. Experimental tests and analysis show that the proposed algorithm performs well.