基于混沌浮点运算的医学图像加密方法与FPGA实现  

A medical image encryption method based on chaos floating-point operation and its realization by FPGA

作　　者：庞宇[1] 魏东 王俊超 Pang Yu;Wei Dong;Wang Junchao(Photoelectronic Information Sensing and Transmission Technology Laboratory,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of Microelectronics and Communication Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆邮电大学光电信息感测与信息传输实验室,重庆400065 [2]重庆大学微电子与通信工程学院,重庆400044

出　　处：《电子技术应用》2023年第1期135-140,共6页Application of Electronic Technique

基　　金：国家自然科学基金(6200010898)。

摘　　要：针对医学图像数据在互联网传输中的高机密性需求,提出一种基于Logistic混沌浮点数运算的加密方法用于医学图像加密。在该加密方法中,结合双精度浮点运算设计了基于Logistic混沌的伪随机数序列发生器(PRNG),并采用硬件描述语言Verilog对PRNG进行了硬件描述。在Altera公司Cyclone Ⅳ系列DE2-115开发平台上实现了加密方法综合设计。从密钥敏感性测试、直方图分析、相关性检验、信息熵处理等密码学角度分析了加密算法的安全性。通过将文中提出的图像加密算法与现有的一些图像加密算法进行比较,发现经过该加密算法加密后图像具有对密钥敏感、相关系数小、信息熵高等特点。此外,基于FPGA的硬件加密系统加密稳定性高,实时性好。Aiming at the high confidentiality requirement of medical image data transmission in the Internet,an encryption method based on Logistic chaotic floating point number operation is proposed for medical image encryption.In this encryption method,PRNG based on Logistic chaos was designed with double-precision floating-point operations and described by the Verilog.The comprehensive design of encryption method is realized on the development platform of Cyclone Ⅳ series DE2-115 of Altera Corporation.The security of encryption algorithm is analyzed from the cryptographic perspectives such as key sensitivity test,histogram analysis,correlation test,information entropy processing,etc.By comparing with some existing image encryption algorithms,it is found that the image encrypted by this encryption algorithm has the characteristics of being sensitive to keys,small correlation coefficient and high information entropy.In addition,the FPGA-based hardware encryption system has high encryption stability and good real-time performance.

关 键 词：图像加密 混沌映射 浮点数运算 PRNG FPGA 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]