基于加权离散帝国竞争算法的密文优化系统研究  

The Research of Cipher Optimization System Based on Weighted Discrete Imperialist Competitive Algorithm

作　　者：冀全朋[1] 

机构地区：[1]重庆文理学院软件工程学院,重庆402160

出　　处：《科学技术与工程》2014年第10期70-76,94,共8页Science Technology and Engineering

基　　金：重庆文理学院校级科研项目(Y2012RJ54);重庆文理学院校级科研项目(Y2013RJ39)资助

摘　　要：为了使图像加密系统具备优化功能;且能有效地解决离散问题,并可优化所有迭代结果,保证密文在每次迭代加密算法过程中都能有效地抵抗各种攻击,提出了一个加权离散帝国竞争算法和分段加密机制;构造了"初始加密-密文优化"的密文优化新结构。根据分段加密机制对图像进行分段加密;然后将密文作为加权离散帝国竞争算法的初始种群,通过该竞争算法对密文进行优化,选择出具有最大信息熵和最低相关系数的密文作为最终输出密文。仿真数据显示:该加密优化系统高度安全;且与其他加密系统相比,处理后的密文,其熵值最大,相关系数最低;且密钥空间巨大,可有效抗击各类攻击。In order to make the eneryption system having the optimization performance, and to solve the discrete problems, as well as guarantee the cipher to efficiency resist all kinds of attacks during each iteration of encryption algorithm, the weighted discrete imperialist competitive algorithm was designed, and the piecewise encryption mechanism was also designed according to chaotic map and the plain image gray value; constructing the new en cryption structure of ＂initial optimizationcipher optimization＂ ; the image encryption optimization system was pro posed based on the weighted discrete imperialist competitive algorithm integration with piecewise encryption mecha nism. the sequences produced by the bernoulli shift map were used to encrypt image under the condition of piece wise encryption mechanism; all the ciphers was used as the initial population of weighted discrete imperialist com petitive algorithm, the ciphers were optimized to choose the image with highest entropy and lowest correlation coeffi cient for final cipher by this competitive algorithm. The results of MATLAB simulation were showed that the security of algorithm was high, and the encryption quality was good; compared with other algorithms, the encryption system had optimization function, its information entropy was highest, and the correlation coefficient was lowest; the key space of this system was huge to resist all kinds＇ attacks.

关 键 词：加权离散帝国竞争算法 密文优化 分段加密机制 相关系数 信息熵 

分 类 号：TP309.41[自动化与计算机技术—计算机系统结构]