This study investigates the physical layer security (PLS) within non-orthogonal multiple access (NOMA) systems in the context of short packet communications (SPC).The primary objective is to obtain a lower block error rate (BLER) and increased secrecy capacity by analyzing different parameters such as the path loss exponent and packet size while fortifying the security of SPC within the NOMA system. The methodology involves mathematical derivations to quantify parameters like signal to-interference-plus-noise ratio (SINR)/signal-to-noise ratio (SNR) alongside pivotal performance metrics like BLER and Secrecy Capacity. Furthermore, MATLAB will be employed to visualize the impact of varying parameters on BLER and SecrecyCapacity, corroborating the numerical derivations.