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Efficient DCT-based secret key generation for the Internet of Things

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Efficient DCT-based secret key generation for the Internet of Things. / Margelis, George; Fafoutis, Xenofon; Oikonomou, George; Piechocki, Robert; Tryfonas, Theo; Thomas, Paul.

In: Ad Hoc Networks, 28.08.2018.

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@article{3f660af9bf504fc18784081c173b2f06,
title = "Efficient DCT-based secret key generation for the Internet of Things",
abstract = "Cryptography is one of the most widely employed means to ensure confidentiality in the Internet of Things (IoT). Establishing cryptographically secure links between IoT devices requires the prior consensus to a secret encryption key. Yet, IoT devices are resource-constrained and cannot employ traditional key distribution schemes. As a result, there is a growing interest in generating secret random keys locally, using the shared randomness of the communicating channel. This article presents a secret key generation scheme, named SKYGlow, which is targeted at resource-constrained IoT platforms and tested on devices that employ IEEE 802.15.4 radios. We first examine the practical upper bounds of the number of secret bits that can be extracted from a message exchange. We contrast these upper bounds with the current state-of-the-art, and elaborate on the workings of the proposed scheme. SKYGlow applies the Discrete Cosine Transform (DCT) on channel observations of exchanged messages to reduce mismatches and increase correlation between the generated secret bits. We validate the performance of SKYGlow in both indoor and outdoor scenarios, at 2.4 GHz and 868 MHz respectively. The results suggest that SKYGlow can create secret 128-bit keys of 0.9978 bits entropy with just 65 packet exchanges, outperforming the state-of-the-art in terms of energy efficiency.",
keywords = "IEEE 802.15.4, Internet of Things (IoT), IoT Security, Physical layer security, Secret key generation",
author = "George Margelis and Xenofon Fafoutis and George Oikonomou and Robert Piechocki and Theo Tryfonas and Paul Thomas",
year = "2018",
month = "8",
day = "28",
doi = "10.1016/j.adhoc.2018.08.014",
language = "English",
journal = "Ad Hoc Networks",
issn = "1570-8705",
publisher = "Elsevier",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Efficient DCT-based secret key generation for the Internet of Things

AU - Margelis, George

AU - Fafoutis, Xenofon

AU - Oikonomou, George

AU - Piechocki, Robert

AU - Tryfonas, Theo

AU - Thomas, Paul

PY - 2018/8/28

Y1 - 2018/8/28

N2 - Cryptography is one of the most widely employed means to ensure confidentiality in the Internet of Things (IoT). Establishing cryptographically secure links between IoT devices requires the prior consensus to a secret encryption key. Yet, IoT devices are resource-constrained and cannot employ traditional key distribution schemes. As a result, there is a growing interest in generating secret random keys locally, using the shared randomness of the communicating channel. This article presents a secret key generation scheme, named SKYGlow, which is targeted at resource-constrained IoT platforms and tested on devices that employ IEEE 802.15.4 radios. We first examine the practical upper bounds of the number of secret bits that can be extracted from a message exchange. We contrast these upper bounds with the current state-of-the-art, and elaborate on the workings of the proposed scheme. SKYGlow applies the Discrete Cosine Transform (DCT) on channel observations of exchanged messages to reduce mismatches and increase correlation between the generated secret bits. We validate the performance of SKYGlow in both indoor and outdoor scenarios, at 2.4 GHz and 868 MHz respectively. The results suggest that SKYGlow can create secret 128-bit keys of 0.9978 bits entropy with just 65 packet exchanges, outperforming the state-of-the-art in terms of energy efficiency.

AB - Cryptography is one of the most widely employed means to ensure confidentiality in the Internet of Things (IoT). Establishing cryptographically secure links between IoT devices requires the prior consensus to a secret encryption key. Yet, IoT devices are resource-constrained and cannot employ traditional key distribution schemes. As a result, there is a growing interest in generating secret random keys locally, using the shared randomness of the communicating channel. This article presents a secret key generation scheme, named SKYGlow, which is targeted at resource-constrained IoT platforms and tested on devices that employ IEEE 802.15.4 radios. We first examine the practical upper bounds of the number of secret bits that can be extracted from a message exchange. We contrast these upper bounds with the current state-of-the-art, and elaborate on the workings of the proposed scheme. SKYGlow applies the Discrete Cosine Transform (DCT) on channel observations of exchanged messages to reduce mismatches and increase correlation between the generated secret bits. We validate the performance of SKYGlow in both indoor and outdoor scenarios, at 2.4 GHz and 868 MHz respectively. The results suggest that SKYGlow can create secret 128-bit keys of 0.9978 bits entropy with just 65 packet exchanges, outperforming the state-of-the-art in terms of energy efficiency.

KW - IEEE 802.15.4

KW - Internet of Things (IoT)

KW - IoT Security

KW - Physical layer security

KW - Secret key generation

UR - http://www.scopus.com/inward/record.url?scp=85053116488&partnerID=8YFLogxK

U2 - 10.1016/j.adhoc.2018.08.014

DO - 10.1016/j.adhoc.2018.08.014

M3 - Article

JO - Ad Hoc Networks

JF - Ad Hoc Networks

SN - 1570-8705

ER -