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This paper investigates the benefits of the existing diversity in the parallel use of both power line and wireless channels, which is termed hybrid power line communication (PLC)/wireless, to improve physical layer security (PLS) for low-bit-rate applications. In this regard, mathematical formulations of the ergodic achievable secrecy rate and the secrecy outage probability are developed for the hybrid PLC/wireless channel model and its incomplete versions. The results show that the hybrid PLC/wireless channel model can provide remarkable benefits in terms of PLS for low-bit-rate applications when the eavesdropper makes use of only one data communication interface.