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Physical layer security (PLS) is superior to classical cryptographytechniques due to its notion of perfect secrecy and independence to aneavesdropper's computational power. One form of PLS arises when Alice and Bob(the legitimate users) exchange signals to extract a common key from the randomcommon channels. The drawback of extracting keys from wireless channels is theample dependence on the dynamicity and fluctuations of the radio channel.However, some radio channels are constant such as line of sight (LoS) and canbe estimated by Eve (an illegitimate user), or can be quite static in behaviourdue to the presence low-mobility users thus restricting the amount ofrandomness. This in turn lowers the secret key rate (SKR) defined as the numberof bits of key generated per channel use. In this work, we aim to address thischallenge by using a reconfigurable intelligent surface (RIS) to produce randomphases at certain carefully curated intervals such that it disrupts the channelin low entropy environments. We propose an RIS assisted key generation method,study its performance, and compare with benchmarks to observe the benefit ofusing an RIS while considering various important metrics such as key mismatchrate and average secret key throughput. Simulations are made to validate ourtheoretical findings showing an improvement in performance when an RIS isdeployed.

Enhancing Secret Key Generation in Block Fading Channels using Reconfigurable Intelligent Surfaces