A Light Weight OFDM Physical Layer Encryption Scheme
Year: 2020
Type: preprint
Abstract: The broadcast nature of wireless networks makes them more susceptible to attacks by eavesdroppers than wired networks. Any untrusted node can eavesdrop on the medium, listen to transmissions and obtain sensitive information within the wireless network. In this paper, we propose a technique to prevent an eavesdropper from gaining any secure information from the system. We propose a new modified mechanism which combines the advantages of two techniques namely iJam and OFDM phase encryption. Our modified mechanism makes iJam more bandwidth efficient by using spatial multiplexing schemes, in our case we use Alamouti space time codes, to take advantage of the repetition inherent in its implementation. Moreover, we extend the adversary model to be an active adversary, which has not been done in the original work of iJam [1] and OFDM phase encryption [2]. We propose, through a max min optimization model, a framework that maximizes the secrecy rate by means of a friendly jammer. We formulate a Zero-Sum game that captures the strategic decision making between the transmitter receiver pair (TXRX) and the adversary. We apply the Fictitious Play (FP) learning algorithm to achieve the Nash equilibria (NE) of the game. Our simulation results show a significant improvement in terms of the ability of the eavesdropper to benefit from the received information over the traditional schemes, i.e. iJam or OFDM phase encryption.
Source: SSRN Electronic Journal
Author: Jabbar Shatti Jahlool
Institution: Dijlah University College
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3206175877