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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.<\/jats:p>","DOI":"10.1155\/2016\/1230387","type":"journal-article","created":{"date-parts":[[2016,5,18]],"date-time":"2016-05-18T21:00:46Z","timestamp":1463605246000},"page":"1-10","source":"Crossref","is-referenced-by-count":20,"title":["Information Security of PHY Layer in Wireless Networks"],"prefix":"10.1155","volume":"2016","author":[{"given":"Weidong","family":"Fang","sequence":"first","affiliation":[{"name":"Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China"},{"name":"Key Laboratory of Wireless Sensor Network & Communication, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 201899, 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