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Physical Communication

A practical scheme for enhancing consistency and independence in wireless key generation for Wi-Fi networks

Jiangtao Wang, Aiqun Hu, Wanling Tian, Jiabao Yu, Xudong Chen

Published Sep 21, 2024• 4 citations
Publisher
DOI
10.1016/j.phycom.2024.102508

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Passive Wi-Fi is a technology to generate 802.11b transmissions using backscatter communication, with power consumption 10000× lower than existing Wi-Fi chipsets. Since wearable devices are typically limited in resources such as power and storage, classical cryptographic security schemes are problematic for them. We instead propose to use wireless channel characteristics to secure data transfer. It has been shown that communicating wireless transceivers are able to generate shared secret keys by measuring channel characteristics at a single frequency. These methods are not applicable to passive Wi-Fi, which uses two different frequencies. In this paper, we describe a method to generate a shared secret key based on wireless channel characteristics in the passive Wi-Fi scenario where the two parties are using dual frequencies.
Wireless networks, particularly Wi-Fi, have become essential in modern life. However, the growing capabilities of quantum computers pose a serious threat to the cryptographic foundations of current Wi-Fi security mechanisms. In this work, we provide a first assessment of how quantum computing affects the security of existing Wi-Fi protocols. We show that all examined Wi-Fi protocols are vulnerable to a CRQC. To ensure long-term security, these protocols must be adapted to employ post-quantum cryptographic schemes.