The broadcast nature of wireless communications imposes the risk of information leakage to adversarial users or unauthorized receivers. Therefore, information security between intended users remains a challenging issue. Most of the current physical layer security techniques exploit channel randomness as a common source between two legitimate nodes to extract a secret key. In this paper, we propose a new simple technique to generate the secret key. Specifically, we exploit the estimated channel to generate a secondary random process (SRP) that is common between the two legitimate nodes. We compare the estimated channel gain and phase to a preset threshold. The moving differences between the locations at which the estimated channel gain and phase exceed the threshold are the realization of our SRP. We simulate an orthogonal frequency division multiplexing (OFDM) system and show that our proposed technique provides a drastic improvement in the key bit mismatch rate (BMR) between the legitimate nodes when compared to the techniques that exploit the estimated channel gain or phase directly. In addition to that, the secret key generated through our technique is longer than that generated by conventional techniques.

Channel Secondary Random Process for Robust Secret Key Generation / Badawy, AHMED MOHAMED HABELROMAN B M; Khattab, T.; Elfouly, T.; Chiasserini, Carla Fabiana; Mohamed, A.; Trinchero, Daniele. - STAMPA. - (2015), pp. 114-119. (Intervento presentato al convegno 2015 IEEE International Wireless Communications and Mobile Computing Conference (IWCMC) tenutosi a Dubrovnik (Croatia) nel August 2015) [10.1109/IWCMC.2015.7289067].

Channel Secondary Random Process for Robust Secret Key Generation

BADAWY, AHMED MOHAMED HABELROMAN B M;CHIASSERINI, Carla Fabiana;TRINCHERO, Daniele
2015

Abstract

The broadcast nature of wireless communications imposes the risk of information leakage to adversarial users or unauthorized receivers. Therefore, information security between intended users remains a challenging issue. Most of the current physical layer security techniques exploit channel randomness as a common source between two legitimate nodes to extract a secret key. In this paper, we propose a new simple technique to generate the secret key. Specifically, we exploit the estimated channel to generate a secondary random process (SRP) that is common between the two legitimate nodes. We compare the estimated channel gain and phase to a preset threshold. The moving differences between the locations at which the estimated channel gain and phase exceed the threshold are the realization of our SRP. We simulate an orthogonal frequency division multiplexing (OFDM) system and show that our proposed technique provides a drastic improvement in the key bit mismatch rate (BMR) between the legitimate nodes when compared to the techniques that exploit the estimated channel gain or phase directly. In addition to that, the secret key generated through our technique is longer than that generated by conventional techniques.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2601564
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