Secret Key Generation Schemes for Physical Layer Security

Megha S. Kumar; R. Ramanathan; M. Jayakumar; Devendra Kumar Yadav

doi:10.14429/dsj.71.15403

Megha S. Kumar Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore - 641 112 https://orcid.org/0000-0003-4391-5246
R. Ramanathan Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore - 641 112 http://orcid.org/0000-0003-1208-6924
M. Jayakumar Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore - 641 112 https://orcid.org/0000-0003-0206-3796
Devendra Kumar Yadav DRDO-Scientific Analysis Group, Delhi - 110 054 https://orcid.org/0000-0002-4429-6398

DOI: https://doi.org/10.14429/dsj.71.15403

Keywords: Wireless networks; Physical layer security; Secret key generation

Abstract

Physical layer security (PLS) has evolved to be a pivotal technique in ensuring secure wireless communication. This paper presents a comprehensive analysis of the recent developments in physical layer secret key generation (PLSKG). The principle, procedure, techniques and performance metricesare investigated for PLSKG between a pair of users (PSKG) and for a group of users (GSKG). In this paper, a detailed comparison of the various parameters and techniques employed in different stages of key generation such as, channel probing, quantisation, encoding, information reconciliation (IR) and privacy amplification (PA) are provided. Apart from this, a comparison of bit disagreement rate, bit generation rate and approximate entropy is also presented. The work identifies PSKG and GSKG schemes which are practically realizable and also provides a discussion on the test bed employed for realising various PLSKG schemes. Moreover, a discussion on the research challenges in the area of PLSKG is also provided for future research.