CAJ | 학술논문

由于图像与人感知外部世界的基本手段相吻合，因此相关的信息量有可能涉及到个人隐私、商业利益、军事机密等，所以多媒体信息的安全问题变得越来越重要。传统的加密系统，如 RSA、DES、IDEA、SAFER 和 FEAL 等，其加密速度慢而且不能有效去除相邻像素的相关性，不适合用于图像加密。经过二十多年研究的混沌加密系统具有良好的特性适合图像加密，但大部分是基于对称加密。对称加密比非对称加密速度更快，但是对于密钥的管理制约了其广泛的使用，为了弥补这一缺陷，文章提出混合密钥机制，不仅可用于图像加密，而且可用于验证。遍历矩阵在加/解密系统中不仅作为公开密钥存在，而且是图像置乱和扩散的关键参数。实验结果表明，与现有的混沌加密系统相比，文章提出的图像加密技术彻底置乱和扩散原始图像，并且拥有至少3.08×105898个密钥的巨大空间，因此足够抵制蛮力攻击。相比于现有的混沌密码系统，文章的实验测试结果更加乐观，在 C 语言下，置乱和扩散阶段的执行时间相当稳定（分别是1.9~2.0毫秒和2.0~2.1毫秒)。与 Yang 和 Ismail 所提出的算法相比，根据文章中的性能评估、敏感度分析和统计分析，文章所提出的算法具有更高的安全性，并且适用于网络传输。
유우도상여인감지외부세계적기본수단상문합，인차상관적신식량유가능섭급도개인은사、상업이익、군사궤밀등，소이다매체신식적안전문제변득월래월중요。전통적가밀계통，여 RSA、DES、IDEA、SAFER 화 FEAL 등，기가밀속도만이차불능유효거제상린상소적상관성，불괄합용우도상가밀。경과이십다년연구적혼돈가밀계통구유량호적특성괄합도상가밀，단대부분시기우대칭가밀。대칭가밀비비대칭가밀속도경쾌，단시대우밀약적관리제약료기엄범적사용，위료미보저일결함，문장제출혼합밀약궤제，불부가용우도상가밀，이차가용우험증。편력구진재가/해밀계통중불부작위공개밀약존재，이차시도상치란화확산적관건삼수。실험결과표명，여현유적혼돈가밀계통상비，문장제출적도상가밀기술철저치란화확산원시도상，병차옹유지소3.08×105898개밀약적거대공간，인차족구저제만력공격。상비우현유적혼돈밀마계통，문장적실험측시결과경가악관，재 C 어언하，치란화확산계단적집행시간상당은정（분별시1.9~2.0호초화2.0~2.1호초)。여 Yang 화 Ismail 소제출적산법상비，근거문장중적성능평고、민감도분석화통계분석，문장소제출적산법구유경고적안전성，병차괄용우망락전수。
For human being, the basic means of the perceptions of the world and the image is consistent. Therefore, the relevant information may possibly related to personal privacy, commercial interests and military secrets, so the security of multimedia information becomes more and more important. Conventional encryption systems, such as RSA, DES, IDEA, SAFER and FEAL, are not suitable for image encryption. Because of its encryption speed is slow and can not effectively remove the correlation between adjacent pixels. The chaotic encryption systems which have been studied for over twenty years have good characteristics for image encryption, but most of the systems are based on a symmetric encryption. Symmetric encryption is faster than symmetric encryption, but the key management restricts its widespread applications. In order to remedy this defect, this paper proposes a hybrid-key mechanism. It’s not only can be used for image encryption, but also can be used in verification. Ergodic matrix in the encryption / decryption system is not only to generate a public key, but also is the key parameter of image confusion and diffusion. The experimental results show that compared with the existing chaotic encryption system, the proposed image encryption technology completely shuffles and change the pixel values of the original image. More than that, it has at least a huge space of 3.08 * 105898 keys, therefore it’s enough to resist the brute force attack. Compared with the existing chaotic cipher system, the experimental results in this paper are more optimistic: coded in the C language, confusion and diffusion stage of the execution time is quite stable (respectively is between 1.9 to 2 ms and 2 to 2.1 ms). Compared with the algorithms introduced by Yang and Ismail, the proposed algorithm, according to the performance evaluation the sensitivity analysis and statistical analysis, our proposed algorithm is more secure, and is suitable for network transmission.