A secret key establishment in frequency division duplex communication systems under active attacker

Abstract

Most of the current research on generating a secret key from wireless fading channels relies on the channel reciprocity feature of the time division duplex link between legitimate entities so that they can acquire related information from the joint wireless connection. This paper investigates the challenge of generating a shared secret key in frequency division duplex communication systems, in which there is no reciprocity between the two nodes, in the presence of an active opponent. We suggest a key generation algorithm that depends on the product of two fading coefficients. We additionally look at the effects of an interfering adversary on the suggested key establishment scheme and solve the problem of evaluating the key rate for a scheme depending on virtual channel gain. We illustrate an adversary model using an optimal attacking strategy to minimize the rate of generating a shared secret key for our suggested algorithm. Additionally, we identify the suitable channel conditions for the non‐zero rate in the existence of an interfering adversary using simulation results.

GROUP SECRET KEY GENERATION FOR 5G Networks

“…As a result of lemma 3.1 in [21], � ℎ � ( ) ; ℎ � ( ) � = ( ; ), which indicates that ℎ � ( ) and ℎ � ( ) maintain the mutual information between and ; which can be used to compute the rate of a generated secret key between two nodes.…”

“…Finally, the process of generating the proposed shared secret key for FDD systems offered in the chain topology of wireless networks. My suggested group key establishment approach depends on merging my FDD point-to-point key generation mechanism [21], and the bitwise XOR process. In the following points, I summarize my contribution:…”