| Summary: | The security in wireless communication networks is an important issue due to the mobility of users and network components, and the fact that the wireless medium is susceptible to eavesdropping and fraud. Motivated by the importance of security in the wireless communication networks, we study the secrecy capacity and secure outage performance of wireless channels in the presence of single as well as multiple eavesdroppers. At first, we study the effect of fading on the secrecy capacity and see, how we can achieve high data rates with reliability in spite of harsh wireless channel subject to the fading. Then, we study the effect of correlation on the secrecy capacity and quantify the loss of secrecy capacity of fading channels due to correlation. Since, the diversity is traditionally exploited to combat the fading in wireless systems. Therefore; secondly, we study the effect of channel diversity on the secrecy capacity of fading channels. This study is also useful to see, how we can overcome the loss of secrecy capacity due to correlation and obtain the target secrecy rate by improving the capacity of main channel exploiting diversity combining. We also investigate the effect of spatial multiplexing on the secrecy capacity and secure outage performance of keyhole multiple-input multiple-output (MIMO) channel. In addition, an achievable secrecy capacity region is developed using secret dirty-paper coding (SDPC) scheme to study the effect of transmit diversity on the secrecy capacity. Since, the group-oriented applications often require same data to be conveyed to multiple users simultaneously, and the traditional multicasting does not provide a secure framework for authentication and privacy for multicast sessions, the lack of which is currently preventing the large-scale deployment of group-oriented applications. Therefore, finally we study secure wireless multicasting and investigate the effect of fading and channel diversity on the secrecy multicast capacity.
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