Efficient Key Extraction for Secure Vehicular Communication Through OTFS

Vehicular communication is delay sensitive and demands high security. However, the time for key establishment between node pairs is limited due to the unique features of fast-moving and high dynamics in Vehicular ad hoc networks (VANETs). Moreover, under high-mobility scenarios, the communication pe...

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Bibliographic Details
Published in:IEEE communications letters 2024-03, Vol.28 (3), p.468-472
Main Authors: Kawoya, Agnes Francis, Wang, Hua, Abood, Mohammed Salah
Format: Article
Language:English
Subjects:
Algorithms
Channel estimation
Communication
Delays
Doppler effect
Manganese
Mobile ad hoc networks
Orthogonal Frequency Division Multiplexing
OTFS security
physical layer secret key
Quantization (signal)
secure vehicular communication
Time-frequency analysis
Wireless communication
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Summary:Vehicular communication is delay sensitive and demands high security. However, the time for key establishment between node pairs is limited due to the unique features of fast-moving and high dynamics in Vehicular ad hoc networks (VANETs). Moreover, under high-mobility scenarios, the communication performance of Orthogonal Frequency Division Multiplexing (OFDM) signals degrades significantly, while Orthogonal Time Frequency Space (OTFS) signals maintains better performance. Towards this end, considering the time for key establishment, we propose an efficient physical layer secret key generation (PLSKG) scheme utilizing OTFS channel state information (CSI). First, we preprocess the estimated CSI with a moving average coding (MAC) algorithm to improve channel reciprocity. Next, we adopt a bidirectional difference quantization (BDQ) for increased key bit generation and propose a one-way reconciliation protocol to remove bit mismatch. Results from extensive simulations have verified that our scheme achieves random 0-b disagreement keys with a high key generation rate and reduced time for key establishment compared to other schemes.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2024.3350121