一种基于波传输和超混沌金融系统的分块图像加密算法

Block Image Encryption Scheme Based on Wave Transmission and Hyperchaotic Financial System

针对目前波函数图像加密算法中密钥空间小和明文相关性差的不足,提出一种新的基于波函数和超混沌金融系统的分块图像加密算法.首先利用超混沌金融系统产生与明文相关的密钥参数,接着确定完全不同的4个波函数的波源起点位置、振幅、波长和相位,4个波函数的叠加作用引起图像像素值的改变,据此实现对明文图像的分块加密.数值仿真和对算法的统计分析、密钥分析、信息熵和抗差分攻击分析表明,本文所提算法具有较大的密钥空间和密钥敏感性,抗蛮力攻击、明文攻击和差分攻击能力强,在图像保密通信中具有巨大的应用潜力.

In terms of the shortcoming of image encryption algorithms based on wave transmission：small key space and less relevance to the plain image, a new block image encryption scheme based on wave transmission and hyperchaotic financial system is presented in this paper. Firstly, the key parameters relevant to the plain image were generated using the hyperchaotic financial system;secondly, the wave source starting point, amplitude, wavelength and phase of four different wave functions were determined, then the superposition of four wave functions on the plain image made the plain image change, and the block image encryption of the plain image can be at- tained. Numerical simulation and the results on statistical analysis, key analysis, information entropy and differential attack analysis in- dicate that the scheme has large key space and key sensitivity,better ability to fight against brute force attack,chosen plaintext attack and differential attack,and the encryption scheme has huge application in image secure communication field.