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With the completion of standardization of fifth-generation (5G) networks, theresearchers have begun visioning sixth-generation (6G) networks that arepredicted to be human-centric. Hence, similar to 5G networks, besides high datarate, providing secrecy and privacy will be the center of attention by thewireless research community. To support the visions beyond 5G (B5G) and 6G, inthis paper we propose a secure radio frequency (RF)-free-space optical (FSO)mixed framework under the attempt of wiretapping by an eavesdropper at the RFhop. We assume the RF links undergo alpha-eta-mu fading whereas the FSO linkexhibits a unified Malaga turbulence model with pointing error. The secrecyperformance is evaluated by deducing expressions for three secrecy metrics i.e.average secrecy capacity, secure outage probability, and probability ofnon-zero secrecy capacity in terms of univariate and bivariate Meijer's G andFox's H functions. We further capitalize on these expressions to demonstratethe impacts of fading, atmospheric turbulence, and pointing errors and show acomparison between two detection techniques (i.e. heterodyne detection (HD) andintensity modulation with direct detection (IM/DD)) that clearly reveals bettersecrecy can be achieved with HD technique relative to the IM/DD method. Theinclusion of generalized fading models at the RF and FSO hops offersunification of several classical scenarios as special cases thereby exhibitinga more generic nature relative to the existing literature. Finally, all theanalytical results are corroborated via Monte-Carlo simulations.

On Secrecy Performance of Mixed {\alpha}-{\eta}-{\mu} and Malaga RF-FSO Variable Gain Relaying Channel