發(fā)布時間：2019-04-15 22:32

【摘要】：最近幾年,無線通訊技術獲得了迅猛的發(fā)展,無線信道的開放性使得這種通信方式面臨著與有線通信方式相比更為嚴峻的安全威脅。傳統(tǒng)安全方案的安全性一方面基于算法的復雜性,另一方面依靠密鑰的隨機性和保密性。要增強安全方案的安全性,傳統(tǒng)手段是設計更為復雜的安全算法或增加密鑰的分組長度,但這樣就不斷的增加了算法執(zhí)行的復雜度,不利于無線通訊設備朝小型化發(fā)展的趨勢。物理層安全技術突破了傳統(tǒng)安全解決方案,它利用物理信道具有隨機性這一天然優(yōu)勢來產(chǎn)生密鑰,這既能大大提高密鑰的生成效率,在理想情況下,還能夠逼近香農(nóng)提出的“一次一密”保密方案,從而有效提高安全方案的安全性能。所以物理層安全技術自提出之日起,就引起了國內(nèi)外學者的廣泛關注。在物理層安全技術中,基于信道特征的密鑰產(chǎn)生技術是其中最為關鍵的技術。本文正是針對這一技術展開研究,主要研究內(nèi)容如下:(1)對于現(xiàn)有的基于物理信道的密鑰生成方案進行了詳細的分析和總結。本文發(fā)現(xiàn)現(xiàn)有方案存在以下三個主要缺陷:第一,在主動攻擊者實施干擾信道攻擊時,沒有較優(yōu)的密鑰生成方案來抵御這類攻擊;第二,缺乏針對超寬帶系統(tǒng)的最佳特征提取算法;第三,在密鑰協(xié)商階段,現(xiàn)有大部分方案僅僅只考慮了密鑰一致性問題,而忽略了密鑰協(xié)商過程中的初始密鑰泄漏問題。(2)針對第一個缺陷,本文研究了基于隨機探測信號的密鑰生成方案。該方案將現(xiàn)有生成方案中的固定探測信號改為隨機探測信號,再與信道沖激函數(shù)進行卷積,從而得到新的特征提取信號。這種方案所生成的密鑰不僅包含信道的隨機性,而且還包含隨機信號的隨機性,因此,它能夠較好地抵御信道主動干擾攻擊。(3)針對第二個缺陷,本文提出了基于多徑時延優(yōu)選提取算法的密鑰生成方案。該算法的原理是對接收端所接收到的多徑時延按照互相度的大小進行快速排序,選出相關性最大的k個值作為信道特征進行提取�；谶@種算法的密鑰生成方案能夠比較大地提高初始安全密鑰的一致性,從而大大降低密鑰協(xié)商的開銷。(4)針對第三個缺陷,本文研究了基于混淆及RS碼協(xié)商的密鑰生成方案。該方案的原理是在協(xié)商階段先對需要傳輸?shù)拿荑�進行混淆處理,再利用RS碼對兩端初始密鑰進行糾錯得到完全一致的密鑰。這種方案既保證了兩端密鑰的一致性,同時也降低了密鑰在傳輸過程中的泄漏風險。(5)本文研究了將以上三種改進算法結合到一起的方案,給出了仿真分析。
[Abstract]:In recent years, the wireless communication technology has been developed rapidly. The openness of the wireless channel makes this communication mode face more serious security threat than the wired communication mode. The security of traditional security scheme is based on the complexity of the algorithm on the one hand, on the other hand, depends on the randomness and confidentiality of the key. In order to enhance the security of the security scheme, the traditional method is to design more complex security algorithms or increase the packet length of the key. However, it increases the complexity of the algorithm execution and is not conducive to the development of wireless communication equipment towards miniaturization. The physical layer security technology breaks through the traditional security solution. It makes use of the natural advantage of the randomness of the physical channel to generate the key, which can not only greatly improve the efficiency of generating the key, but also under the ideal circumstances, It can also approach Shannon's one-time-one-secret security scheme, so as to effectively improve the security performance of the security scheme. Therefore, the physical layer security technology has attracted the attention of scholars both at home and abroad since it was put forward. Among the physical layer security techniques, key generation based on channel characteristics is the most important one. The main contents of this paper are as follows: (1) the existing key generation schemes based on physical channel are analyzed and summarized in detail. In this paper, we find that there are three main defects in the existing schemes: first, when active attackers carry out interference channel attacks, there is no better key generation scheme to resist such attacks; Secondly, there is a lack of optimal feature extraction algorithm for UWB systems. Thirdly, in the phase of key agreement, most of the existing schemes only consider the problem of key consistency, but ignore the initial key leakage problem in the process of key agreement. (2) for the first defect, In this paper, a key generation scheme based on random detection signal is studied. In this scheme, the fixed detection signal in the existing generation scheme is changed into a random detection signal, and then convolution with the channel impulse function to obtain a new feature extraction signal. The key generated by this scheme not only contains the randomness of the channel, but also the randomness of the random signal, so it can resist the channel active interference attack well. (3) in view of the second defect, In this paper, a key generation scheme based on multi-path delay optimization extraction algorithm is proposed. The principle of this algorithm is that the multipath delay received by the receiver is sorted quickly according to the degree of mutual phase, and the k values with the greatest correlation are selected to extract the channel features. The key generation scheme based on this algorithm can greatly improve the consistency of initial security keys, thus greatly reducing the overhead of key agreement. (4) aiming at the third defect, In this paper, a key generation scheme based on confusion and RS code agreement is studied. The principle of this scheme is to obfuscate the key that needs to be transmitted in the negotiation phase, and then use RS code to correct the initial keys at both ends to get a completely consistent key. This scheme not only guarantees the consistency of the keys at both ends, but also reduces the leakage risk of the keys in the process of transmission. (5) in this paper, the scheme combining the above three improved algorithms is studied, and the simulation analysis is given.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN918.4

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