Free Space Optical (FSO) communication is gaining significant attention as it serves as a better candidate for high-data wireless communication than the existing RF communication technologies, as it provides less interference when compared with radio frequency transmission and also due to its extremely small beamwidth serves to be a promising candidate for secure wideband communication. However, in a terrestrial FSO link, transmission is affected due to turbulence in the atmosphere. Analogous to fading in RF wireless channels, attenuation in the received optical intensity takes place due to inhomogeneities in the atmosphere referred to as scintillation. Taking into account of the turbulence-induced fading, certain optical channel models have been proposed and the probability density functions (PDFs) of the received irradiance are computed. In our work, Physical Layer Security of a Free-Space Optical Communication link is investigated for certain eavesdropping scenarios where the eavesdropper exploits the divergence of the laser beam due to atmospheric turbulence to compromise the security of the transmission link. We explore the possibility of secrecy in a terrestrial free-space optical channel subject to Malaga (ℳ) turbulence between two legitimate parties in the presence of an adversary. To address the security issue, a suitable system model is proposed and a non-conventional approach is followed to model the received irradiance fluctuations with separate distributions for the coherent and non-coherent components of the transmitted beam. The initial part of the work will be presented in this talk where, analysis of secrecy is carried out by computing the closed form expression of the probability of strictly positive secrecy capacity (SPSC) in terms of turbulence parameters. The possibility of secure communication is explored for mild to strong turbulence regimes.