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基于混沌浮點(diǎn)運(yùn)算的醫(yī)學(xué)圖像加密方法與FPGA實(shí)現(xiàn)
2023年電子技術(shù)應(yīng)用第1期
龐宇1,,魏東1,,王俊超2
1.重慶郵電大學(xué) 光電信息感測(cè)與信息傳輸實(shí)驗(yàn)室 重慶400065;2.重慶大學(xué) 微電子與通信工程學(xué)院,,重慶400044
摘要: 針對(duì)醫(yī)學(xué)圖像數(shù)據(jù)在互聯(lián)網(wǎng)傳輸中的高機(jī)密性需求,,提出一種基于Logistic混沌浮點(diǎn)數(shù)運(yùn)算的加密方法用于醫(yī)學(xué)圖像加密,。在該加密方法中,結(jié)合雙精度浮點(diǎn)運(yùn)算設(shè)計(jì)了基于Logistic混沌的偽隨機(jī)數(shù)序列發(fā)生器(PRNG),,并采用硬件描述語言 Verilog對(duì)PRNG進(jìn)行了硬件描述,。在Altera公司Cyclone IV系列DE2-115開發(fā)平臺(tái)上實(shí)現(xiàn)了加密方法綜合設(shè)計(jì)。從密鑰敏感性測(cè)試,、直方圖分析,、相關(guān)性檢驗(yàn)、信息熵處理等密碼學(xué)角度分析了加密算法的安全性,。通過將文中提出的圖像加密算法與現(xiàn)有的一些圖像加密算法進(jìn)行比較,,發(fā)現(xiàn)經(jīng)過該加密算法加密后圖像具有對(duì)密鑰敏感、相關(guān)系數(shù)小,、信息熵高等特點(diǎn),。此外,基于FPGA的硬件加密系統(tǒng)加密穩(wěn)定性高,,實(shí)時(shí)性好,。
中圖分類號(hào):TP309
文獻(xiàn)標(biāo)志碼:A
DOI: 10.16157/j.issn.0258-7998.222975
中文引用格式: 龐宇,魏東,,王俊超. 基于混沌浮點(diǎn)運(yùn)算的醫(yī)學(xué)圖像加密方法與FPGA實(shí)現(xiàn)[J]. 電子技術(shù)應(yīng)用,,2023,49(1):135-140.
英文引用格式: Pang Yu,,Wei Dong,,Wang Junchao. A medical image encryption method based on chaos floating-point operation and its realization by FPGA[J]. Application of Electronic Technique,2023,,49(1):135-140.
A medical image encryption method based on chaos floating-point operation and its realization by FPGA
Pang Yu1,,Wei Dong1,Wang Junchao2
1.Photoelectronic Information Sensing and Transmission Technology Laboratory,Chongqing University of Posts and Telecommunications,,Chongqing 400065,,China;2.School of Microelectronics and Communication Engineering,,Chongqing University,,Chongqing 400044,China)
Abstract: 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.
Key words : image encryption,;chaos map,;floating point arithmetic;PRNG,;FPGA

0 引言

    目前,,互聯(lián)網(wǎng)技術(shù)的快速發(fā)展使電子醫(yī)療變得便捷可行和普遍流行。電子醫(yī)療提供了一種基于互聯(lián)網(wǎng)系統(tǒng)的遠(yuǎn)程,、在線就醫(yī)技術(shù),。患者可以聯(lián)系專家醫(yī)生進(jìn)行在線診斷,。在線就醫(yī)過程中,,一些涉及患者隱私的醫(yī)學(xué)圖像數(shù)據(jù)需要通過互聯(lián)網(wǎng)存儲(chǔ)和傳輸,在此過程中可能會(huì)面臨數(shù)據(jù)泄露問題,。而數(shù)據(jù)加密是避免醫(yī)學(xué)圖像數(shù)據(jù)泄露,、保護(hù)隱私的最佳方法。與普通圖像相比,,醫(yī)學(xué)圖像具有的冗余,、數(shù)據(jù)量大、像素相關(guān)性大等特點(diǎn)[1-2],,使得類似于AES等傳統(tǒng)的加密技術(shù)對(duì)醫(yī)學(xué)圖像這類特殊格式數(shù)據(jù)的加密效率低下[3],。醫(yī)學(xué)圖像加密算法不僅需要很高的安全性,還需要可觀的加密速度,。

    基于混沌算法的偽隨機(jī)數(shù)生成器(Pseudo Random Number Generator , PRNG)生成的偽隨機(jī)序列對(duì)初始值極度敏感,、周期長(zhǎng)、密鑰空間大,,與其他數(shù)據(jù)序列相比在安全性上具有明顯的優(yōu)勢(shì),,用于醫(yī)學(xué)圖像加密具有很可觀的加密效果[4]。除了算法嚴(yán)格性外,,一種有效的加密系統(tǒng)實(shí)現(xiàn)技術(shù)可保證加密的速度得到提升,。而硬件實(shí)現(xiàn)的方式在能夠滿足應(yīng)用實(shí)時(shí)性的同時(shí)又可以防止運(yùn)行算法的攻擊[5]。現(xiàn)場(chǎng)可編程邏輯器件(Field -Programmable Gate Array ,,FPGA)以其高并行,、可定制,、能重構(gòu)、低成本等特點(diǎn)十分適合于混沌加密算法的硬件實(shí)現(xiàn)[6],。




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作者信息:

龐宇1,魏東1,,王俊超2

(1.重慶郵電大學(xué) 光電信息感測(cè)與信息傳輸實(shí)驗(yàn)室 重慶400065,;2.重慶大學(xué) 微電子與通信工程學(xué)院,重慶400044)




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