G. Margelis, X. Fafoutis, G. Oikonomou, R. Piechocki, T. Tryfonas, P. Thomas

Abstract:
The confidentiality of communications in the Internet of Things (IoT) is critical, with cryptography currently being the most widely employed method of ensuring it. Establishing cryptographically secure communication links between two transceivers requires the pre-agreement on some key, unknown to an external attacker. In recent years there has been growing attention in techniques that generate a shared random key through observation of the channel and its effects on the exchanged messages. In this work we present SKYGlow, a novel scheme for secret-key generation, designed for IoT devices, such as IEEE 802.15.4 and Bluetooth Low Energy (BLE) transceivers. SKYGlow employs the Discreet Cosine Transform (DCT) of channel observations and Slepian-Wolf coding for information reconciliation. Real-life experiments have resulted in the creation of 128-bit secret keys with only 65 packet exchanges and with an entropy of 0.9978 bits, making our scheme much more energy-efficient compared with others in the existing literature.
Reference:
G. Margelis, X. Fafoutis, G. Oikonomou, R. Piechocki, T. Tryfonas, P. Thomas, "Physical layer secret-key generation with discreet cosine transform for the Internet of Things", in Proc. IEEE ICC, 2017
Bibtex Entry:
@INPROCEEDINGS{Margelis-2017-icc,
  title = {Physical layer secret-key generation with discreet cosine transform for the Internet of Things},
  author = {George Margelis and Xenofon Fafoutis and George Oikonomou and Robert Piechocki and Theo Tryfonas and Paul Thomas},
  year = {2017},
  month = {7},
  doi = {10.1109/ICC.2017.7997419},
  isbn = {9781467390002},
  booktitle = {Proc. IEEE ICC},
  publisher = {IEEE},
  gsid = {7131705677557939788},
  oa-url = {https://research-information.bristol.ac.uk/en/publications/physical-layer-secretkey-generation-with-discreet-cosine-transform-for-the-internet-of-things(3d03e451-0462-4711-9bd4-c8be5232af9e).html},
  abstract = {The confidentiality of communications in the Internet of Things (IoT) is critical, with cryptography currently being the most widely employed method of ensuring it. Establishing cryptographically secure communication links between two transceivers requires the pre-agreement on some key, unknown to an external attacker. In recent years there has been growing attention in techniques that generate a shared random key through observation of the channel and its effects on the exchanged messages. In this work we present SKYGlow, a novel scheme for secret-key generation, designed for IoT devices, such as IEEE 802.15.4 and Bluetooth Low Energy (BLE) transceivers. SKYGlow employs the Discreet Cosine Transform (DCT) of channel observations and Slepian-Wolf coding for information reconciliation. Real-life experiments have resulted in the creation of 128-bit secret keys with only 65 packet exchanges and with an entropy of 0.9978 bits, making our scheme much more energy-efficient compared with others in the existing literature.},
}
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Physical layer secret-key generation with discreet cosine transform for the Internet of Things