An enhanced ofdm light weight physical layer encryption scheme

Ahmed A. Alabdel Abass, Navya Prarthana Divvala


The broadcast nature of wireless networks makes them more susceptible to attacks by eavesdroppers than wired networks. Any untrusted node can simply 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 Alamouti scheme to take advantage of the repetition inherent in its implementation. Moreover, the adversary model here is extended to the active adversary case, 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 and the adversary. We apply the Fictitious Play (FP) learning algorithm to reach 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.


active adversary; alamouti scheme; iJam; OFDM phase encryption;

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ISSN 2088-8708, e-ISSN 2722-2578