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Feasibility analysis of Inter-Pulse Intervals based solutions for cryptographic token generation by two electrocardiogram sensors
تجزیه و تحلیل امکان سنجی راه حل های مبتنی بر فاصله بین پالس برای تولید توکن رمزنگاری توسط دو سنسور الکتروکاردیوگرام-2019 In this paper we address the problem of how two devices that are sensing the same heart signal
can generate the same cryptographic token by extracting them from the Inter-Pulse Intervals (IPIs)
of each cardiac signal. Our analysis is based on the use of a run-time monitor, which is extracted
from a formal model and verified against predefined properties, combined with a fuzzy extractor to
improve the final result. We first show that it is impossible, in general, to correct the differences
between the IPIs derived from two captured electrocardiogram (ECG) signals when using only error
correction techniques, thus being impossible to corroborate previous claims on the feasibility of this
approach. Then, we provide a large-scale evaluation of the proposed method (run-time monitor and
fuzzy extractor) over 19 public databases from the Physionet repository containing heart signals. The
results clearly show the practicality of our proposal achieving a 91% of synchronization probability
for healthy individuals. Additionally, we also conduct an experiment to check how long the sensors
should record the heart signal in order to generate tokens of 32, 64 and 128 bits. Contrarily to what
it is usually assumed (6, 12, and 24 s for individuals with a heart rate of 80 beats-per-minute), the
sensors have to wait 13, 28 and 56.5 s on median, respectively, to derive the same token from both
sensors Keywords: Biometrics | Security | Privacy | Body sensor networks |
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