Description:
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 pr...