  In this letter, the secrecy performance of a mixed free space optics (FSO)
and radio frequency (RF) system is analyzed from physical layer security (PHY)
perspective. In this scenario, one or more eavesdroppers are trying to
intercept the confidential signal in a mixed FSO/RF system. The faded FSO links
are modeled by Malaga ($\mathcal{M} $) distribution and RF link is
characterized by Nakagami-$m$ distribution. Exact closed form expressions for
secrecy performance metrics such as secrecy outage probability and strictly
positive secrecy capacity are derived and analyzed for the proposed system in
terms of Fox's H-function. Furthermore, the asymptotic expressions for these
performance metrics are analyzed. Finally, all the results are verified by
Monte-Carlo simulations.
