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<p>To overcome the limitations of visible light communications (VLC) systems while still benefiting from the high data rates and inherently secure transmissions, hybrid systems combining radio-frequency (RF) and VLC have gained appealing towards future generation of wireless networks. In this paper, the potential of hybrid systems from the security perspective is investigated by proposing a joint precoding and user association (JPUA) design to maximize the sum secrecy rate of a multiuser hybriddoi:10.36227/techrxiv.20412177.v1 fatcat:omwdzkq65rgurexy2yeb2vdrl4