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Security countermeasures are considered one of the major concerns in the emerging Internet of Things (IoT) paradigm to guarantee an efficient network operation. To investigate the security problem in unauthorized access to sensitive IoT information and services, this paper, particularly, studies physical-layer security of a typical system model constituted by a reconfigurable intelligent surface (RIS) assisted access point (AP), legitimate user, and an eavesdropper. In this model, a RIS is deployed to increase the system secrecy and communication performances to deal with eavesdropping attacks. To measure the security performances, we firstly expose analytical results for the secrecy outage probability. We provide insights with asymptotic analysis to identify system parameters that significantly affect the secrecy performance of our proposed RIS-aided IoT systems. In particular, the findings show that by controlling …