Noncoherent Massive MIMO with Embedded One-Way Function Physical Layer Security

TL;DR

This paper introduces a physical layer security scheme for massive MIMO systems that uses a low-complexity continuous optimization as a one-way function, enhancing security against eavesdroppers even with perfect channel knowledge.

Contribution

It presents a novel continuous optimization-based projection matrix construction method that acts as a one-way function, improving physical layer security in nonsquare differential MIMO systems.

Findings

Security level increases with more transmit antennas.

Scheme is resilient against pilot contamination attacks.

Security remains strong even with perfect eavesdropper channel knowledge.

Abstract

We propose a novel physical layer security scheme that exploits an optimization method as a one-way function. The proposed scheme builds on nonsquare differential multiple-input multiple-output (MIMO), which is capable of noncoherent detection even in massive MIMO scenarios and thus resilient against risky pilot insertion and pilot contamination attacks. In contrast to conventional nonsquare differential MIMO schemes, which require space-time projection matrices designed via highly complex, discrete, and combinatorial optimization, the proposed scheme utilizes projection matrices constructed via low-complexity continuous optimization designed to maximize the coding gain of the system. Furthermore, using a secret key generated from the true randomness nature of the wireless channel as an initial value, the proposed continuous optimization-based projection matrix construction method becomes a one-way function, making the proposed scheme a physical layer secure differential MIMO system. An attack algorithm to challenge the proposed scheme is also devised, which demonstrates that the security level achieved improves as the number of transmit antennas increases, even in an environment where the eavesdropper can perfectly estimate channel coefficients and experience asymptotically large signal-to-noise ratios.