發(fā)布時(shí)間：2018-04-04 21:10

  本文選題：光碼分多址　切入點(diǎn)：加密算法　出處：《深圳大學(xué)》2017年碩士論文

【摘要】：光碼分多址(Optical Code Division Multiple Access,OCDMA)技術(shù)因其具有的接入?yún)f(xié)議簡(jiǎn)單、高安全性、軟容量等優(yōu)點(diǎn),近年來(lái)得到了廣泛的研究,在軍用、電子商務(wù)以及民用接入網(wǎng)等場(chǎng)合均有廣闊的應(yīng)用前景。過(guò)去,人們普遍認(rèn)為安全性作為OCDMA系統(tǒng)的固有特征,OCDMA系統(tǒng)理應(yīng)具備良好的安全性能,但最新研究表明OCDMA系統(tǒng)存在著安全隱患。另外,隨著計(jì)算機(jī)技術(shù)的發(fā)展,眾多本以為安全的加密算法相繼被破解,如數(shù)據(jù)加密標(biāo)準(zhǔn)(Data Encryption Standard,DES)、RSA算法等。事實(shí)說(shuō)明無(wú)論OCDMA系統(tǒng)還是加密算法提供單層的安全性都是有限的,各自提高它們安全性同時(shí)又受到各種因素制約。但是,如果能結(jié)合兩者安全性的優(yōu)點(diǎn),這些安全問(wèn)題也許就能迎刃而解了。因此,本文提出基于OCDMA與加密算法的跨層通信系統(tǒng)方案,并首次定量分析了該系統(tǒng)的安全性。本課題來(lái)自于國(guó)家自然科學(xué)基金“自由空間光通信的物理層安全與光編碼方法研究”(NSFC61671306)和深圳市學(xué)科布局項(xiàng)目“基于光編碼物理層安全的光通信關(guān)鍵技術(shù)研究”(JCYJ20160328145357990),研究工作主要包括以下幾個(gè)方面:1)提出基于OCDMA與加密算法的跨層通信系統(tǒng)方案,該系統(tǒng)物理層采用非相干一維時(shí)域編碼OCDMA系統(tǒng),而完整的AES加密算法應(yīng)用于數(shù)據(jù)層。本文首次提出一種對(duì)跨層通信系統(tǒng)安全性進(jìn)行定量分析的方法,該方法定量分析了竊聽(tīng)信噪比、碼字類(lèi)型、系統(tǒng)用戶(hù)數(shù)、同步/異步、碼字?jǐn)r截時(shí)間、密碼分析時(shí)間等參數(shù)對(duì)系統(tǒng)安全性能的影響,并采用光系統(tǒng)仿真軟件Optisystem結(jié)合Matlab搭建了單用戶(hù)和多用戶(hù)狀態(tài)下的系統(tǒng)模型,仿真結(jié)果表明了只有在匹配碼字解碼且正確密鑰解密情況下,系統(tǒng)才能恢復(fù)出信源信息。2)提出基于WSS的二維可重構(gòu)OCDMA與加密算法的跨層通信系統(tǒng)方案,該方案使用了一種基于波長(zhǎng)選擇開(kāi)關(guān)(Wavelength Selection Switch,WSS)的二維可重構(gòu)的光編/解碼器,和采用了超連續(xù)譜脈沖光源(使用非線(xiàn)性光纖拓展譜寬),支持了該WSS的動(dòng)態(tài)碼重構(gòu),提供了最多76個(gè)波長(zhǎng)選擇,并且成功進(jìn)行了無(wú)誤碼的編/解碼傳輸實(shí)驗(yàn)。另外,本文定量分析了該系統(tǒng)的安全性,分析結(jié)果說(shuō)明碼字可重構(gòu)能有效增強(qiáng)系統(tǒng)的安全性,極大提高了竊聽(tīng)者碼字?jǐn)r截難度。最后,根據(jù)系統(tǒng)碼字可重構(gòu)以及加密算法可變換,本文研究了跨層通信系統(tǒng)進(jìn)一步安全性融合、效能提高的可行性,同時(shí)分析了系統(tǒng)的安全性。
[Abstract]:Optical Code Division Multiple access OCDMA (OCDMA) technology has been widely studied in recent years because of its advantages of simple access protocol, high security and soft capacity. It has broad application prospects in military, electronic commerce and civil access networks.In the past, it was generally believed that security is an inherent feature of OCDMA systems and that OCDMA systems should have good security performance. However, recent research shows that there are hidden security problems in OCDMA systems.In addition, with the development of computer technology, many encryption algorithms which were supposed to be secure have been cracked one after another, such as data Encryption Encryption standard and RSA algorithm.It is proved that both the OCDMA system and the encryption algorithm provide limited single-layer security, and each of them is restricted by various factors to improve their security.However, if the advantages of both security can be combined, these security problems may be solved.Therefore, a cross-layer communication system based on OCDMA and encryption algorithm is proposed, and the security of the system is quantitatively analyzed for the first time.This topic comes from the National Natural Science Foundation of China "Research on physical layer Security and Optical coding method of Free Space Optical Communication" and Shenzhen subject layout Project "Research on key Technologies of Optical Communication based on Optical coding physical layer Security"JCYJ20160328145357990, the research work mainly includes the following aspects: 1) A cross-layer communication system scheme based on OCDMA and encryption algorithm is proposed.The physical layer of the system uses incoherent one-dimensional time domain coding OCDMA system, while the complete AES encryption algorithm is applied to the data layer.In this paper, a quantitative analysis method for the security of cross-layer communication system is proposed for the first time. The method quantitatively analyzes the signal-to-noise ratio of eavesdropping, codeword type, number of system users, synchronous / asynchronous, codeword interception time, etc.The influence of cryptographic analysis time and other parameters on the security performance of the system is analyzed. The system model under single user and multi-user states is built by using optical system simulation software Optisystem and Matlab.Simulation results show that only when the matching codeword is decoded and the key is decrypted correctly, can the system recover the source information. (2) A cross-layer communication scheme based on WSS is proposed for two-dimensional reconfigurable OCDMA and encryption algorithm.The scheme uses a two-dimensional reconfigurable optical encoder / decoder based on wavelength selection switch wavelength Selection switch (WSS) and a supercontinuum spectral pulse light source (using nonlinear fiber to expand spectrum width to support the dynamic code reconstruction of the WSS.A maximum of 76 wavelength selections are provided, and an error-free coding / decoding transmission experiment is successfully carried out.In addition, the security of the system is quantitatively analyzed in this paper. The results show that codeword reconfiguration can effectively enhance the security of the system and greatly improve the difficulty of intercepting the eavesdropper.Finally, according to the reconfigurable codeword of the system and the transformation of encryption algorithm, this paper studies the feasibility of further security fusion and efficiency improvement of cross-layer communication system, and analyzes the security of the system at the same time.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN918;TN929.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 祝f翔,王林斗;非相干OCDMA系統(tǒng)地址碼的比較[J];光纖與電纜及其應(yīng)用技術(shù);2003年05期

2 張海濱,黃培中,宋文濤,羅漢文,李榮玉,李毓麟;全光OCDMA系統(tǒng)綜述[J];通信技術(shù);2003年02期

，

本文編號(hào)：1711695