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 Practical Full Key Recovery on a Google Titan Security Key Laurent Imbert 85e91c1fc8e34ffd51350186e1276372 lirmm.fr laurent-imbert 6246 17701-6246 https://orcid.org/0000-0001-9362-2869 https://www.idref.fr/157640620 Victor Lomné 64b99da38728535952c57b8a3254bf08 lirmm.fr 859402 385919-859402 Camille Mutschler 1551910 2267972-1551910 https://www.idref.fr/285368257 Thomas Roche b06d067d665e2afb45fdf5d9cd997b39 ninjalab.io 1398556 443948-1398556 Laurent Imbert 85e91c1fc8e34ffd51350186e1276372 lirmm.fr 2025-08-18 12:34:03 2025-12-02 03:04:03 2025-08-21 14:55:28 2025-02 contributor Laurent Imbert 85e91c1fc8e34ffd51350186e1276372 lirmm.fr CCSD lirmm-05213095 https://hal-lirmm.ccsd.cnrs.fr/lirmm-05213095 imbert:lirmm-05213095 Emmanuel Prouff; Guénaël Renault; Matthieu Rivain; Colin O'Flynn. <i>Embedded Cryptography 3</i>, WILEY, pp.245-256, 2025, Computer Science - Cryptography, Data Security, 9781789452150 Emmanuel Prouff; Guénaël Renault; Matthieu Rivain; Colin O'Flynn. Embedded Cryptography 3, WILEY, pp.245-256, 2025, Computer Science - Cryptography, Data Security, 9781789452150 CNRS - Centre national de la recherche scientifique Université de Montpellier Paul-Valéry Université Perpignan Via Domitia Exact Computing Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier Université de Montpellier Axe sécurité du LIRMM Université de Montpellier (2015-2021) Université de Montpellier - EPE International No Practical Full Key Recovery on a Google Titan Security Key Laurent Imbert 85e91c1fc8e34ffd51350186e1276372 lirmm.fr laurent-imbert 6246 17701-6246 https://orcid.org/0000-0001-9362-2869 https://www.idref.fr/157640620 Victor Lomné 64b99da38728535952c57b8a3254bf08 lirmm.fr 859402 385919-859402 Camille Mutschler 1551910 2267972-1551910 https://www.idref.fr/285368257 Thomas Roche b06d067d665e2afb45fdf5d9cd997b39 ninjalab.io 1398556 443948-1398556 9781789452150 Embedded Cryptography 3 Emmanuel Prouff Guénaël Renault Matthieu Rivain Colin O'Flynn WILEY Computer Science - Cryptography, Data Security 245-256 2025-02 Damien Vergnaud English Side-channel Attack Ecdsa Computer Science [cs]/Cryptography and Security [cs.CR] Book sections Book sections Book sections

This chapter presents a practical case study of side-channel analysis. The work studies the security of the Google Titan Security Key1 (a hardware security token for two-factor authentication) and shows that its secure element, the NXP A700x chip, is susceptible to a side-channel attack (through the observation of its local electromagnetic (EM) activity). Given physical access to a Google Titan Security Key for around 10 hours, this allows us to retrieve a user-specific secret key (there is one key for each remote account) and therefore to clone the security device.

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