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Journal of Sensors
Volume 2016 (2016), Article ID 1230387, 10 pages
http://dx.doi.org/10.1155/2016/1230387
Review Article

Information Security of PHY Layer in Wireless Networks

1Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China
2Key Laboratory of Wireless Sensor Network & Communication, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 201899, China
3Shanghai Internet of Things Co., Ltd., Shanghai 201899, China
4Shanghai Research Center for Wireless Communications, Shanghai 200335, China
5College of Physics and Electronic Information Engineering, Qinghai University for Nationalities, Xining, Qinghai 810000, China

Received 2 December 2015; Accepted 16 February 2016

Academic Editor: Fei Yu

Copyright © 2016 Weidong Fang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Since the characteristics of wireless channel are open and broadcasting, wireless networks are very vulnerable to be attacked via eavesdropping, jamming, and interference. As traditional secure technologies are not suitable for PHY layer of wireless networks, physical-layer security issues become a focus of attention. In this paper, we firstly identify and summarize the threats and vulnerabilities in PHY layer of wireless networks. Then, we give a holistic overview of PHY layer secure schemes, which are divided into three categories: spatial domain-based, time domain-based, and frequency domain-based. Along the way, we analyze the pros and cons of current secure technologies in each category. In addition, we also conclude the techniques and methods used in these categories and point out the open research issues and directions in this area.