CAJ | 학술논문

为了实现对彩色图像信息的有效保护，提出一种像素置乱及密文交错扩散技术相结合的加密算法。首先对3个分数阶混沌系统产生的混沌序列进行优化改进，得到两组不同的性能优良的混沌密钥序列，并将RGB彩色图像转换为由基色分量组成的灰度图像；然后，利用一组改进的混沌密钥序列对该灰度图像的像素位置进行置乱；最后，利用另一组改进的混沌密钥序列对置乱图像进行2轮基色分量之间的密文交错扩散操作，得到加密图像。仿真实验表明，该算法具有足够大的密钥空间，高度的密钥敏感性，较好的像素分布特性，且在抵抗唯密文攻击、差分攻击、选择明文攻击及统计攻击方面都具有良好的性能，可以广泛地应用于多媒体数据的保密通信中。
위료실현대채색도상신식적유효보호，제출일충상소치란급밀문교착확산기술상결합적가밀산법。수선대3개분수계혼돈계통산생적혼돈서렬진행우화개진，득도량조불동적성능우량적혼돈밀약서렬，병장RGB채색도상전환위유기색분량조성적회도도상；연후，이용일조개진적혼돈밀약서렬대해회도도상적상소위치진행치란；최후，이용령일조개진적혼돈밀약서렬대치란도상진행2륜기색분량지간적밀문교착확산조작，득도가밀도상。방진실험표명，해산법구유족구대적밀약공간，고도적밀약민감성，교호적상소분포특성，차재저항유밀문공격、차분공격、선택명문공격급통계공격방면도구유량호적성능，가이엄범지응용우다매체수거적보밀통신중。
In order to achieve effective protection of color image information , an encryption algorithm with the combination of pix-el scrambling and ciphertext cross-diffusion technology is proposed .Firstly, the chaotic sequences generated by three fractional-order chaotic systems are modified to obtain two groups of chaotic key sequences with good property , and the RGB color image is converted into a gray-scale image which is composed by primary color components .Secondly , the pixels ’ positions of the gray-scale image are scrambled by means of one group of improved chaotic key sequences .Thirdly, by using another group of improved chaotic key sequences , the study modifies the pixels ’ values of the scrambled image with two rounds of ciphertext cross-diffusion operations between the primary color components and gets the cipher image .Simulation shows that , this algorithm is of a suffi-ciently large key space , highly sensitive keys , better pixel distribution characteristics , and a good performance against ciphertext-only attack , differential attack , chosen plaintext attack and statistical attack .This can be widely used in secure communication of multimedia data .