Interference Assisted Secret Communication

Xiaojun Tang, Ruoheng Liu, Predrag Spasojevic, H. Vincent Poor
2011 IEEE Transactions on Information Theory  
Wireless communication is susceptible to eavesdropping attacks because of its broadcast nature. This paper illustrates how interference can be used to counter eavesdropping and assist secrecy. In particular, a wire-tap channel with a helping interferer (WT-HI) is considered. Here, a transmitter sends a confidential message to its intended receiver in the presence of a passive eavesdropper and with the help of an independent interferer. The interferer, which does not know the confidential
more » ... , helps in ensuring the secrecy of the message by sending an independent signal. An achievable secrecy rate and several computable outer bounds on the secrecy capacity of the WT-HI are given for both discrete memoryless and Gaussian channels.
doi:10.1109/tit.2011.2121450 fatcat:byhxmmqnljd4hockfwar7adpje