A Side Journey To Titan


Thomas Roche and Victor Lomné, NinjaLab, Montpellier, France; Camille Mutschler, NinjaLab, Montpellier, France and LIRMM, Univ. Montpellier, CNRS, Montpellier, France; Laurent Imbert, LIRMM, Univ. Montpellier, CNRS, Montpellier, France


The Google Titan Security Key is a FIDO U2F hardware device proposed by Google (available since July 2018) as a two-factor authentication token to sign in to applications such as your Google account. In this paper, we present a side-channel attack that targets the Google Titan Security Key's secure element (the NXP A700x chip) by the observation of its local electromagnetic radiations during ECDSA signatures. This work shows that an attacker can clone a legitimate Google Titan Security Key. As a side observation, we identified a novel correlation between the elliptic curve group order and the lattice-based attack success rate.

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@inproceedings {274638,
author = {Thomas Roche and Victor Lomn{\'e} and Camille Mutschler and Laurent Imbert},
title = {A Side Journey To Titan},
booktitle = {30th USENIX Security Symposium (USENIX Security 21)},
year = {2021},
isbn = {978-1-939133-24-3},
pages = {231--248},
url = {https://www.usenix.org/conference/usenixsecurity21/presentation/roche},
publisher = {USENIX Association},
month = aug

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