Secure Performance Analysis of RIS-aided Wireless Communication Systems

Since Internet of Things (IoT) is suggested as the fundamental platform to adapt massive connections and secure transmission, we study physical-layer authentication in the point-to-point wireless systems relying on reconfigurable intelligent surfaces (RIS) technique. Due to lack of direct link from IoT devices (both legal and illegal devices) to the access point, we benefit from RIS by considering two main secure performance metrics. As main goal, we examine the secrecy performance of a RIS-aided wireless communication systems which show secure performance in the presence of an eavesdropping IoT devices. In this circumstance, RIS is placed between the access point and the legitimate devices and is designed to enhance the link security. To specify secure system performance metrics, we firstly present analytical results for the secrecy outage probability. Then, secrecy rate is further examined. Interestingly, we are to control both the average signal-to-noise ratio at the source and the number of metasurface elements of the RIS to achieve improved system performance. We verify derived expressions by matching Monte-Carlo simulation and analytical results.

I. Introduction

By enabling interconnection with the Internet, advantages of Internet of Things (IoT) with various kinds of things (such as smart phones, Vehicles, sensors, etc.) need reliable and secure connections to provide promising applications including e-health, intelligent transportation systems, smart home and smart city [1], [2]. In the perspective of live, work, and communication, IoT plays an important role to improve quality of experience. Unfortunately, IoT also causes an increasing challenge in term of its security with ubiquitous connected devices associated with our daily activities such as monitoring, recording and analyzing data [3], [4]. In fact, since the malicious attackers occupy the opportunities to manipulate the physical objects in IoT system which cause severe problems both the cyber world and cyber-physical world [5]–[7]. For instance, several situations such as unlock the doors or disable the braking and steering Systems are related to vulnerabilities found in connected cars or hackers. Therefore, it is necessary to address urgently these security threats and issues to reduce crucial concerns for IoT technologies.