混沌图像加密中的密钥分析

The key analysis of chaotic image encryption

针对图像传输中存在诸多安全问题,提出图像加密很有必要。首先给出了常见的对图像的行加密以及列加密的算法及仿真,为了进一步确保图像的安全性,重点给出了混沌序列的特点,利用其非线性及其初值敏感性对图像进行了加密及解密操作。本文以Logistic映射为例,通过对其密钥算法的分析,利用MATLAB仿真发现该方法更加可靠难以被破译,并且密钥增加方式更为灵活。从而进一步确保图像传输的安全性及可靠性。

Aiming at many security problems in image transmission,It is necessary to propose image encryption. firstly,the common algorithms and simulations of row and column encryption are given. In order to further ensure the security of the image,the characteristics of chaotic sequence are emphatically given,and the image is encrypted and decrypted by using its nonlinearity and initial value sensitivity. This paper takes Logistic mapping as an example,through the analysis of its key algorithm,using MATLAB simulation found that this method is more reliable and difficult to be deciphered,and the way to increase the key is more flexible. In order to further ensure the security and reliability of image transmission.