Paper 2023/1068

Optical Cryptanalysis: Recovering Cryptographic Keys from Power LED Light Fluctuations

Ben Nassi, Ben-Gurion University of the Negev
Ofek Vayner, Ben-Gurion University of the Negev
Etay Iluz, Ben-Gurion University of the Negev
Dudi Nassi, Ben-Gurion University of the Negev
Or Hai Cohen, Ben-Gurion University of the Negev
Jan Jancar, Masaryk University
Daniel Genkin, Georgia Institute of Technology
Eran Tromer, Columbia University
Boris Zadov, Ben-Gurion University of the Negev
Yuval Elovici, Ben-Gurion University of the Negev
Abstract

Although power LEDs have been integrated in various devices that perform cryptographic operations for decades, the cryptanalysis risk they pose has not yet been investigated. In this paper, we present optical cryptanalysis, a new form of cryptanalytic side-channel attack, in which secret keys are extracted by using a photodiode to measure the light emitted by a device’s power LED and analyzing subtle fluctuations in the light intensity during cryptographic operations. We analyze the optical leakage of power LEDs of various consumer devices and the factors that affect the optical SNR. We then demonstrate end-to-end optical cryptanalytic attacks against a range of consumer devices (smartphone, smartcard, and Raspberry Pi, along with their USB peripherals) and recover secret keys (RSA, ECDSA, SIKE) from prior and recent versions of popular cryptographic libraries (GnuPG, Libgcrypt, PQCrypto-SIDH) from a maximum distance of 25 meters

Metadata
Available format(s)
PDF
Category
Attacks and cryptanalysis
Publication info
Preprint.
Contact author(s)
nassib @ post bgu ac il
ofekvay @ post bgu ac il
etayil @ post bgu ac il
nassid @ post bgu ac il
ora2 @ post bgu ac il
445358 @ mail muni cz
genkin @ gatech edu
et2555 @ columbia edu
zadov @ post bgu ac il
elovici @ bgu ac il
History
2023-07-11: approved
2023-07-09: received
See all versions
Short URL
https://ia.cr/2023/1068
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2023/1068,
      author = {Ben Nassi and Ofek Vayner and Etay Iluz and Dudi Nassi and Or Hai Cohen and Jan Jancar and Daniel Genkin and Eran Tromer and Boris Zadov and Yuval Elovici},
      title = {Optical Cryptanalysis: Recovering Cryptographic Keys from Power {LED} Light Fluctuations},
      howpublished = {Cryptology {ePrint} Archive, Paper 2023/1068},
      year = {2023},
      url = {https://eprint.iacr.org/2023/1068}
}
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