Wyniki wyszukiwania - BazTech

1

Secrecy Rate Region Enhancement in Multiple Access Wiretap Channel

Shah Shahid Mehraj

Journal of Telecommunications and Information Technology

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2022

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nr 2

14--25

EN

It is commonly known that physical layer security is achieved with a trade-off in terms of the achievable rate. Hence, security constraints generate rate losses in wiretap channels. To mitigate such rate losses in multi-user channels, we propose a coding/decoding scheme for multi-user multiple access wiretap channel (MAC-WT), where previously transmitted messages are used as a secret key to enhance the secrecy rates of the transmitting users, until the usual Shannon capacity region of a multiple access channel (MAC) is achieved without the secrecy constraint. With this coding scheme, all messages transmitted in the recent past are secure with respect to all the information of the eavesdropper till now. To achieve this goal, we introduce secret key buffers at both the users and the legitimate receiver. Finally, we consider a fading MAC-WT and show that with this coding/decoding scheme, we can achieve the capacity region of a fading MAC channel (in the ergodic sense).

2

Comparing Gausian and exact models of malicious interference in VLC systems

Blinowski Grzegorz, Mościcki Adam

International Journal of Electronics and Telecommunications

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2019

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Vol. 65, No. 2

277--286

EN

Visible Light Communication (VLC) is a technique for high-speed, low-cost wireless data transmission based on LED luminaries. Wireless LAN environments are a major application of VLC. In these environments, VLC is used in place of traditional systems such as Wi-Fi. Because of the physical characteristics of visible light, VLC is considered to be superior to traditional radio-based communication in terms of security. However, as in all wireless systems, the security of VLC with respect to eavesdropping, signal jamming and modification must be analyzed. This paper focuses on the aspect of jamming in VLC networks. In environments where multiple VLC transmitters are used, there is the possibility that one or more transmitters will be hostile (or "rogue"). This leads to communication disruption, and in some cases, the hijacking of the legitimate data stream. In this paper we present the theoretical system model that is used in simulations to evaluate various rogue transmission scenarios in a typical indoor enviro.The typical approach used so far in jamming analysis assumes that all disruptive transmissions may be modeled as Gaussian noise, but this assumption may be too simplistic. We analyze and compare two models of VLC jamming: the simplified Gaussian and the exact model, where the full characteristics of the interfering signal are taken into account. Our aim is to determine which methodology is adequate for studying signal jamming in VLC systems.

3

Information theoretical secure key sharing protocol for noiseless public constant parameter channels without cryptographic assumptions

Korzhik Valery, Starostin Vladimir, Kabardov Muaed, Gerasimovich Aleksandr, Yakovlev Victor, Zhuvikin Aleksey, Morales-Luna Guillermo

Annals of Computer Science and Information Systems

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2019

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Vol. 18

327-–332

EN

We propose a new key sharing protocol executed through any constant parameter noiseless public channel (as Internet itself) without any cryptographic assumptions and protocol restrictions on SNR in the eavesdropper channels. This protocol is based on extraction by legitimate users of eigenvalues from randomly generated matrices. A similar protocol was proposed recently by G. Qin and Z. Ding. But we prove that, in fact, this protocol is insecure and we modify it to be both reliable and secure using artificial noise and privacy amplification procedure. Results of simulation prove these statements.

4

Praktyczna implementacja steganografii w VLC

Januszewski P., Stępniak G., Szczypiorski K.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2017

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nr 8-9

693--696, CD

PL

W tym referacie przedstawiamy wyniki pierwszej (według naszej wiedzy) praktycznej implementacji steganografii w systemie komunikacji poprzez światło widzialne (VLC). VLC jest to nowy, tani, bezprzewodowy system transmisji danych, który wykorzystuje fale z zakresu światła widzialnego. Testy eksperymentalne wykazały, że jesteśmy w stanie uzyskać transmisję steganograficzną o szybkości około 1 Mbit/s(wykorzystując technikę DS-CDMA) ukrytą w jawnej transmisji danych o szybkości 110 Mbit/s przesyłanej za pomocą modulacji PPM.

EN

In this paper we describe first (to our knowledge) practical implementation of steganography in visible light communication (VLC). VLC is a new low-cost wireless data transmission system, which employs the visible light spectrum. Our experimental results shows that we are able to achieve approximately 1 Mbit/s steganographic transmission (using DS-CDMA technique) hidden in 110 Mbit/s overt data stream send with PPM modulation.

5

Metody zabezpieczania danych przesyłanych w sieciach WLAN oparte na najnowszych odkryciach teorii informacji

Pilc M.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2013

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nr 7

577--582

PL

Artykuł składa się z dwóch części. W pierwszej części dokonano przeglądu metod zapewniania poufności i integralności danych, stosowanych w sieciach bezprzewodowych opartych na standardach rodziny IEEE 802.11. Omówiono stabości protokołów WEP oraz WPA, a także przedstawiono protokół WPA2 oparty na standardzie IEEE 802.11 i. W drugiej części artykułu przedstawiono odkrycia teorii informacji zmierzające do wyeliminowania możliwości przechwycenia informacji przez intruza drogą radiową. Skupiono się przy tym na kodach LDPC (Low Density Parity-Check). Podjęto także dyskusję na temat ograniczeń stosowalności tych kodów dla transmisji z widzialnością optyczną anten (Line-of-Sight).

EN

The following article is composed of two parts. The first part comprises an overview of methods providing data confidentiality and integrity in wire- less LANs based on IEEE 802.11 family of standards. The weaknesses of WEP and WPA protocols were discussed. Protocol WPA2 based on IEEE802.1H was presented. The second part of the article presents the newest discoveries in information theory which seem to eliminate the possibility of capturing messages sent via radio waves. LDPC codes are focused on in detail. Additionally, limited applicability of these codes to Line-of-sight transmissionis discussed.