Secret Key Generation Based on Channel State Information in a mmWave Communication System
Conference: SCC 2019 - 12th International ITG Conference on Systems, Communications and Coding
02/11/2019 - 02/14/2019 at Rostock, Germany
doi:10.30420/454862049
Proceedings: SCC 2019
Pages: 6Language: englishTyp: PDF
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Authors:
Felkaroski, Nikola; Petri, Markus (IHP, Im Technologiepark 25, 15236 Frankfurt (Oder), Germany)
Abstract:
Secret key generation by exploiting the wireless channel traits of the PHY layer has been a popular theoretical research topic in recent years. In this paper we show a practical implementation of this idea, including the algorithmic approaches of the constituent steps in the generation process. We use the channel state information (CSI) of a static 60 GHz OFDM wireless system as a source of randomness necessary for our key extraction. By exploiting the CSI from multiple subcarriers, we achieve a bit generation rate of up to 16 Kbits per second. Test results from both simulated and measured channel data show that our extracted keys with a length of 160-256 bits have a high entropy and pass all of the NIST tests suitable for the key length.