"Security at the Physical and MAC Layers in Wireless Networks"

TL;DRAbstract

The main objective of this dissertation is to investigate security solutions and issues at the lower layers in wireless networks. In the first part, the potential of the physical layer in providing security solutions is investigated. Recently, it has been found that the multipath wireless channel in TDD wireless communications can provide a common reciprocal source of randomness that can be leveraged in secret key generation and agreement. Based on this property, many key generation mechanisms have been proposed. In contrary to the common direct quantization and extraction mechanisms, we propose two intelligent mechanisms for secret bits extraction. They are based on mitigating error through optimized guard intervals (GI mechanism) or through phase-shifting the channel taps (PS mechanism). The high efficiency of these two mechanisms compared to the regular quantization mechanisms is manifested through simulations based on a realistic channel model. We also investigate some practical is

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