  Through ordinary transmissions over wireless multicast networks are greatly
hampered due to the simultaneous presence of fading and shadowing of wireless
channels, secure transmissions can be enhanced by properly exploiting random
attributes of the propagation medium. This study focuses on the utilization of
those attributes to enhance the physical layer security (PLS) performance of a
dual-hop wireless multicast network over kappa-mu shadow-fading channel under
the wiretapping attempts of multiple eavesdroppers. In order to improve the
secrecy level, the best relay selection strategy among multiple relays is
employed. Performance analysis is carried out based on the mathematical
modeling in terms of analytical expressions of non-zero secrecy capacity
probability, secure outage probability, and ergodic secrecy capacity over
multicast relay networks. Capitalizing on those expressions, the effects of
system parameters, i.e., fading, shadowing, the number of antennas, destination
receivers, eavesdroppers, and relays, on the secrecy performance are
investigated. Numerical results show that the detrimental impacts caused by
fading and shadowing can be remarkably mitigated using the well-known
opportunistic relaying technique. Moreover, the proposed model unifies secrecy
analysis of several classical models, thereby exhibiting enormous versatility
than the existing works.
