【摘要】：在信息安全領(lǐng)域、測試領(lǐng)域、工程實踐領(lǐng)域,隨機數(shù)都發(fā)揮著重要的作用。一般情況,隨機數(shù)發(fā)生器分為偽隨機數(shù)發(fā)生器和物理隨機數(shù)發(fā)生器。用計算機能夠產(chǎn)生高速偽隨機數(shù),但是偽隨機數(shù)具有周期性,尤其會對信息安全系統(tǒng)造成嚴重的后果。而基于量子力學(xué)、熱噪聲、振蕩器采樣和混沌電路等傳統(tǒng)物理熵源的物理隨機數(shù)發(fā)生器,卻由于熵源的帶寬限制,不能夠滿足當前大容量通信的需求。直到混沌激光的出現(xiàn),才促進了物理隨機數(shù)發(fā)生器的快速發(fā)展。由于混沌激光的高帶寬和大振幅的特點,基于混沌激光的物理隨機數(shù)發(fā)生器得到了國內(nèi)外研究者的廣泛關(guān)注。目前,基于激光器外部參數(shù)(例如反饋強度、外腔長度、激光器的偏置電流等)對光反饋混沌激光熵源生成隨機數(shù)的影響已經(jīng)有所研究討論,但是激光器內(nèi)部參數(shù)對生成隨機數(shù)性能的影響還沒有深入研究,這些參數(shù)對于獲取高質(zhì)量、高速率的隨機數(shù)有著重要的作用。本文圍繞基于寬帶混沌激光生成高速物理隨機數(shù)這一研究課題,展開了如下的工作內(nèi)容:1)介紹了三種混沌激光的產(chǎn)生方式,其中說明了光反饋式相對其它二者的優(yōu)點。構(gòu)建了基于長腔光反饋半導(dǎo)體激光器的混沌熵源,研究了外腔反饋率和注入電流比共同作用下對長腔光反饋半導(dǎo)體激光器的混沌熵源特性的影響,重點研究了混沌信號復(fù)雜度和帶寬的動態(tài)分布。研究結(jié)果表明,低反饋率和低注入電流比的混沌信號幅值分布趨于正態(tài)分布,有利于生成物理隨機數(shù)。2)介紹了基于長腔光反饋半導(dǎo)體激光器的混沌熵源生成物理隨機數(shù)的產(chǎn)生流程,其中重點介紹并解釋了電采樣和電量化的含義、注意事項以及簡單的后續(xù)處理。介紹并分析了NIST SP 800-22和Diehard兩種隨機數(shù)測試標準的使用方法,并解決了Diehard測試的格式轉(zhuǎn)換問題。3)設(shè)計了基于長腔光反饋半導(dǎo)體激光器的混沌熵源生成隨機數(shù)的方案,研究了激光器關(guān)鍵內(nèi)部參數(shù)對光反饋半導(dǎo)體激光器的混沌熵源生成隨機數(shù)性能的影響。仿真結(jié)果表明,隨著線寬增強因子、載流子壽命的增大,光反饋半導(dǎo)體激光器的混沌激光信號的延時峰值逐漸減小,相對應(yīng)的最大李指數(shù)逐漸增大。分別基于不同的線寬增強因子和載流子壽命產(chǎn)生的混沌信號提取隨機數(shù),利用NIST SP 800-22軟件對所生成的隨機數(shù)性能進行測試,并討論了二者對混沌信號帶寬以及測試結(jié)果的影響。
[Abstract]:In the field of information security, testing, engineering practice, random numbers play an important role. In general, random number generator is divided into pseudorandom number generator and physical random number generator. High speed pseudorandom numbers can be generated by computer, but pseudorandom numbers have periodicity, especially for information security system. However, the traditional physical random number generator based on quantum mechanics, thermal noise, oscillator sampling and chaotic circuit can not meet the needs of large capacity communication due to the bandwidth limitation of entropy source. It was not until the chaotic laser appeared that the rapid development of physical random number generator was promoted. Due to the characteristics of high bandwidth and large amplitude of chaotic laser, the physical random number generator based on chaotic laser has been widely concerned by researchers at home and abroad. At present, the effects of external parameters (such as feedback intensity, external cavity length, bias current, etc.) on the random number generation of chaotic laser entropy source based on optical feedback have been discussed. However, the influence of laser internal parameters on the performance of generating random numbers has not been deeply studied. These parameters play an important role in obtaining high quality and high rate random numbers. This paper focuses on the research of generating high speed physical random numbers based on wideband chaotic laser. The main contents are as follows: 1) three kinds of chaotic laser generation methods are introduced and the advantages of optical feedback method compared with the other two are illustrated. A chaotic entropy source based on long cavity optical feedback semiconductor laser is constructed. The effects of external cavity feedback rate and injection current ratio on the chaotic entropy source characteristics of long cavity optical feedback semiconductor laser are studied. The dynamic distribution of complexity and bandwidth of chaotic signals is studied. The results show that the amplitude distribution of chaotic signals with low feedback rate and low injection current ratio tends to normal distribution. In this paper, the process of generating physical random numbers by chaotic entropy source based on long cavity optical feedback semiconductor laser is introduced. The meaning of electric sampling and electroquantization is introduced and explained emphatically. Attention and simple follow-up. This paper introduces and analyzes the application methods of NIST SP 800-22 and Diehard random number test standards, and solves the problem of format conversion of Diehard test. 3) A scheme of generating random numbers by chaotic entropy source based on long cavity optical feedback semiconductor laser is designed. The effect of the key internal parameters of the laser on the random number generation of the chaotic entropy source of the optical feedback semiconductor laser is studied. The simulation results show that with the increase of linewidth enhancement factor and carrier lifetime, the delay peak of chaotic laser signal of optical feedback semiconductor laser decreases gradually, and the corresponding maximum lie exponent increases gradually. Random numbers are extracted from chaotic signals generated by different linewidth enhancement factors and carrier lifetime, and the performance of the generated random numbers is tested by NIST SP 800-22 software. The influence of them on the bandwidth of chaotic signal and the test results are also discussed.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248.4

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