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Bảo mật dữ liệu tầng vật lý trong mạng truyền tin không dây sử dụng relay theo giao thức Decode-and-Forward và Amplify-and-Forward

CSKH-01.2017 - (Tóm tắt) Trong mô hình truyền tin phân tầng, để bảo mật dữ liệu, bên cạnh việc áp dụng các kỹ thuật mã hóa truyền thống tại các tầng phía trên, ý tưởng về bảo mật tại tầng vật lý (Physical Layer Security-PLS) cho mạng truyền tin không dây đang được cộng đồng các nhà nghiên cứu khoa học trên toàn thế giới quan tâm. Nếu như ban đầu kỹ thuật này đòi hỏi kênh truyền của người nghe lén có độ suy hao lớn hơn kênh truyền của người thu hợp pháp, thì trong thời gian gần đây, với sự hỗ trợ của các relay, thì không bắt buộc phải có giả thiết trên. Bài báo này trình bày kết quả nghiên cứu tổng quan và phân tích các kết quả, hướng nghiên cứu này trong thời gian gần đây.

Abstract- Beside cryptography algorithms which are based on the upper layers of protocol stack to ensure confidentiality in communication systems, the idea of physical layer security (PLS) in wireless network systems dates back to (in) 1970s. In the past decade, this idea has been studied by many researchers from all around the world. Initially, this method required that the source-destination channel is better than source-eavesdropper channel. However, current advances in technology, especially with the help of relay and beamforming technique the PLS problem is now possible even though the above channel condition is not met. For wireless relay networks, there are two main relaying schemes often employed for physical layer security Decode-and-Forward (DF) and Amplify-and-Forward (AF). In this paper, we present the state-of-the-art of both these techniques in physical layer security and some future research directions related to them. 

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Nguyễn Như Tuấn, Đặng Vũ Sơn, Nguyễn Ngọc Cương