Security Analysis of Quantization Schemes for Channel-based Key Extraction

Christian Zenger, Jan Zimmer, Chris­tof Paar

Workshop on Wireless Communication Security at the Physical Layer, WiComSec-Phy 2015, Coimbra, Portugal, July 22, 2015


Abstract

The use of reciprocal and random properties of wireless channels for the generation of secret keys is a highly attractive option for many applications that operate in a mobile environment. In recent years, several practice-oriented protocols have been proposed, but unfortunately without a sufficient and consistent security analysis and without a fair comparison between each other. This can be attributed to the fact that until now neither a common evaluation basis, nor a security metric in an on-line scenario (e.g., with changing channel properties) was proposed. We attempt to close this gap by presenting test vectors based on a large measurement campaign, an extensive comparative evaluation framework (including ten protocols as well as new on-line entropy estimators), and a rigorous experimental security analysis. Further, we answer for the first time a variety of security and performance related questions about the behavior of 10 channel-based key establishment schemes from the literature.

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Tags: Channel-based key extraction, on-line entropy estimation, physicallayersecurity, practice- oriented protocols, quantization schemes, security analysis