Gareth T. Davies
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gareth-t-davies.bsky.social
Gareth T. Davies
@gareth-t-davies.bsky.social
78 followers 150 following 3 posts
Cryptography at NXP
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gareth-t-davies.bsky.social
Important career update
A screenshot from my Pokémon Go account showing 100,000 Pokémon caught
November 18, 2025 at 8:23 PM
Reposted by Gareth T. Davies
securedproject.bsky.social
@gareth-t-davies.bsky.social from NXP shows how secure multi-party computation and homomorphic encryption make it possible to train models and run analyses without revealing the underlying data.
He will also join our upcoming webinar to explain these techniques in detail.
youtu.be/TWR9jmW23xg
Meet The SECURED Partners - NXP Semiconductors
YouTube video by Secured EU Project
youtu.be
November 16, 2025 at 6:34 PM
gareth-t-davies.bsky.social
New paper! 🛂
We managed to get OCAKE, a post-quantum candidate PAKE, running with ML-KEM on a super tiny chip that is built for ECC and used today in real passports/ID cards. It was faster than we thought it would be!
Next-gen chips with dedicated support will be even faster 🚀
eprint.ing.bot ePrint Updates @eprint.ing.bot · May 9
Post-Quantum Cryptography in eMRTDs: Evaluating PAKE and PKI for Travel Documents (Nouri Alnahawi, Melissa Azouaoui, Joppe W. Bos, Gareth T. Davies, SeoJeong Moon, Christine van Vredendaal, Alexander Wiesmaier) ia.cr/2025/812
Abstract. Passports, identity cards and travel visas are examples of machine readable travel documents (MRTDs) or eMRTDs for their electronic variants. The security of the data exchanged between these documents and a reader is secured with a standardized password authenticated key exchange (PAKE) protocol known as PACE. A new world-wide protocol migration is expected with the arrival of post-quantum cryptography (PQC) standards. In this paper, we focus on the impact of this migration on constrained embedded devices as used in eMRTDs. We present a feasibility study of a candidate post-quantum secure PAKE scheme as the replacement for PACE on existing widely deployed resource-constrained chips. In a wider context, we study the size, performance and security impact of adding post-quantum cryptography with a focus on chip storage and certificate chains for existing eMRTDs. We show that if the required post-quantum certificates for the eMRTD fit in memory, the migration of existing eMRTD protocols to their post-quantum secure equivalent is already feasible but a performance penalty has to be paid. When using a resource constrained SmartMX3 P71D600 smart card, designed with classical cryptography in mind, then execution times of a post-quantum secure PAKE algorithm using the recommended post-quantum parameter of the new PQC standard ML-KEM can be done in under a second. This migration will be aided by future inclusion of dedicated hardware accelerators and increased memory to allow storage of larger keys and improve performance. Image showing part 2 of abstract.
May 9, 2025 at 9:25 AM
gareth-t-davies.bsky.social
I gave a talk at the NIST Crypto Agility workshop last week, the slides are now online:
csrc.nist.gov/Events/2025/...
I wanted to get across that further (protocol) standardization still needs to happen in many places, and not reinventing the wheel will make agility easier and PQC migration faster.
Slide from Presentation at Crypto Agility workshop. Standards work still needs to happen in many protocols that affected embedded systems, and building advanced crypto from generic building blocks makes implementation easier on constrained devices.
April 25, 2025 at 2:29 PM
Reposted by Gareth T. Davies
eprint.ing.bot
Security Analysis of the WhatsApp End-to-End Encrypted Backup Protocol (Gareth T. Davies, Sebastian Faller, Kai Gellert, Tobias Handirk, Julia Hesse, Máté Horvárth, Tibor Jager) ia.cr/2023/843
June 6, 2023 at 9:57 AM