基于Logistic映射和z-映射的图像分组加密算法

摘要

Aiming at the image encryption,a kind of image grouping encryption algorithm based on logistic mapping and z-mapping is put forward.In each iteration of this algorithm,the matrix scrambling,the nonlinear numerical re-placement and the numeral value iteration are alternately used.By a large number of experimental verification,this al-gorithm can effectively resist plaintext attack,differential attack and statistical analysis,and it has larger key space and higher security,and the speed of encryption and decryption is quite fast,which is suitable for data storage.%针对图像加密，提出了一种基于Logistic映射和z-映射的图像分组加密算法，该算法在每一轮迭代中，交替使用矩阵置乱、非线性数值替换和数值关联混迭三级操作。经大量实验验证，该算法能够有效抵抗明文攻击、差分攻击、统计分析，密钥空间较大，因而安全性较高，并且加解密速度相当快，适用于数据存储。