Secrecy Capacity of Wireless Channels
Keywords:
Information theory, Physical-layer security, Secrecy capacity, Wireless channelAbstract
As wireless networking has a wide range of applications, its security is an issue of concern. Encryption is traditionally the main route to secure communications. Nevertheless, this security solution may be difficult to implement in some modern wireless networks, e.g., ad hoc and radio-frequency identification (RFID) networks which require large-scale organization and low computational complexity, respectively. An alternative approach is physical-layer security, which leverages the physical properties of radio channels to achieve reliable data transmission without the need of secret keys. Since this kind of security emerged from the information theoretical characterization of secrecy, there has been great interest in secrecy capacity of various wireless channels. This paper provides an overview of such capacity for a single user.
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