【摘要】：隨著社會的進(jìn)步以及科技的發(fā)展,筆記本電腦、智能終端等移動設(shè)備越來越普及,人們對于信息安全防護(hù)也越來越重視;傳統(tǒng)的觀念認(rèn)為,網(wǎng)絡(luò)連接是計(jì)算機(jī)等設(shè)備受到攻擊的必要條件,當(dāng)其斷開網(wǎng)絡(luò)連接時,其數(shù)據(jù)信息就是相對安全的,但是信息安全防護(hù)是一個博弈過程,會不斷地遇到新的挑戰(zhàn),比如通過高頻聲波建立的隱蔽通信就是一種非常規(guī)的安全攻擊手段,其可以在物理隔離的設(shè)備之間進(jìn)行數(shù)據(jù)信息的隱蔽傳輸,而不被設(shè)備使用者發(fā)覺。本文主要研究一種以高頻聲波為媒介的隱蔽通信技術(shù),該技術(shù)既可以在信息安全領(lǐng)域中應(yīng)用,也可以作為設(shè)備間進(jìn)行近距離通信的一種方法,研究重點(diǎn)是設(shè)計(jì)并實(shí)現(xiàn)在較低信噪比下通過高頻聲波在設(shè)備間進(jìn)行通信的方案,及其在實(shí)際場景中的應(yīng)用,主要工作如下:(1)通過對高頻聲波在空氣中的傳輸特性、普通計(jì)算機(jī)內(nèi)置的音頻輸入輸出設(shè)備的頻響特性以及人耳的聽力特性進(jìn)行調(diào)研,為通信方案的設(shè)計(jì)進(jìn)行必要的準(zhǔn)備;(2)研究并選擇了聲波通信系統(tǒng)的結(jié)構(gòu),設(shè)計(jì)出單向點(diǎn)對點(diǎn)通信方案并分別通過Matlab和MFC進(jìn)行了實(shí)現(xiàn),給出了方案的性能數(shù)據(jù);(3)針對點(diǎn)對點(diǎn)通信方案存在的局限,給出了兩種改進(jìn)方案——雙向通信方案和變帶寬通信方案,并給出了相應(yīng)的實(shí)現(xiàn)或仿真實(shí)現(xiàn);(4)討論了聲波通信的應(yīng)用場景,并實(shí)現(xiàn)了在筆記本間鍵盤記錄傳輸?shù)膽?yīng)用和在Android手機(jī)之間信息傳輸?shù)膽?yīng)用。通過本文中對聲波通信方案設(shè)計(jì)及其實(shí)現(xiàn),可知,在物理隔離的設(shè)備之間完全可以通過聲波進(jìn)行設(shè)備間通信。同時,由于人耳對高頻聲波的不敏感特性,如采用高頻聲波進(jìn)行設(shè)備間通信,可以達(dá)到隱蔽信息傳輸?shù)男Ч?尤其適合在近距離會面等場景下的應(yīng)用;另外,由于在移動設(shè)備間進(jìn)行聲波通信,操作簡單且不需要額外硬件的支持,使得聲波通信也完全有機(jī)會成為近距離通信方案的一種并得到廣泛的推廣和應(yīng)用。
[Abstract]:With the progress of society and the development of science and technology, notebook computers, intelligent terminals and other mobile devices are becoming more and more popular, and people pay more and more attention to the protection of information security. The traditional concept holds that the network connection is the necessary condition for the computer and other devices to be attacked. When it disconnects from the network connection, its data and information are relatively secure, but the protection of information security is a game process. New challenges will be encountered, such as covert communication through high frequency acoustic waves, which is an unconventional security attack that can transmit data between physically isolated devices without being detected by device users. This paper mainly studies a kind of covert communication technology based on high frequency acoustic wave. This technology can be applied in the field of information security, and can also be used as a method of close-range communication between devices. The emphasis of the research is to design and realize the scheme of communication between equipments through high frequency acoustic wave at lower signal-to-noise ratio, and its application in actual scene. The main work is as follows: (1) through the transmission characteristics of high-frequency acoustic wave in air, the main work is as follows. The frequency response characteristics and hearing characteristics of the audio input and output devices built in the ordinary computer are investigated in order to prepare for the design of the communication scheme. (2) the structure of acoustic communication system is studied and selected, and the one-way point-to-point communication scheme is designed and implemented by Matlab and MFC respectively, and the performance data of the scheme is given. (3) in view of the limitation of the point communication scheme, two improved schemes-two-way communication scheme and variable bandwidth communication scheme are given, and the corresponding implementation or simulation implementation is given. (4) the application scenario of acoustic communication is discussed, and the application of keyboard recording transmission between notebooks and information transmission between Android mobile phones is realized. Through the design and implementation of acoustic communication scheme in this paper, it can be seen that the communication between the physically isolated devices can be carried out by acoustic wave. At the same time, because the human ear is insensitive to the high frequency acoustic wave, such as using high frequency acoustic wave to communicate between devices, it can achieve the effect of covert information transmission, especially suitable for the application in close-range meeting and other scenarios. In addition, due to the simple operation and no additional hardware support for acoustic communication between mobile devices, acoustic communication has a full chance of becoming a short-range communication scheme and has been widely popularized and applied.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN914

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