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In this era of 5G technology, the ever-increasing demands for high data rateslead researchers to develop hybrid satellite-terrestrial (HST) networks as asubstitution to the conventional cellular terrestrial systems. Since an HSTnetwork suffers from a masking effect which can be mitigated by adopting theterrestrial relaying strategy, in this work, we focus on wireless multicastingthrough an HST relaying net-work (HSTRN) in which a satellite sends messages tomultiple terrestrial nodes via multiple relays under the wiretapping efforts ofmultiple eavesdroppers. Our concern is to protect the multicast messages frombeing eavesdropped taking advantage of the well-known opportunistic relayingtechnique. We consider the satellite links follow Shadowed Rician fadingwhereas the terrestrial links undergo alpha-mu fading. The secrecy performanceof the proposed HSTRN model is accomplished by deriving expressions for theprobability of nonzero secrecy multicast capacity, ergodic secrecy multicastcapacity, and secure outage probability for multicasting in closed-form.Capitalizing on the derived expressions, we analyze how a perfect secrecy levelcan be preserved in spite of harsh channel conditions and also present asecrecy trade-off in terms of the number of relays, multicast users, andmultiple eavesdroppers. Finally, the numerical analyses are corroborated viaMonte-Carlo simulations.

Security Analysis in Multicasting over Shadowed Rician and {\alpha}-{\mu} Fading Channels: A Dual-hop Hybrid Satellite Terrestrial Relaying Network