Luke Garratt
Security Engineer at Amazon
New York, New York, United States
Summary
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Senior🎓
Top SchoolLuke Garratt is a security engineer and applied cryptographer with a PhD and a decade of experience translating cutting‑edge research into production security for devices and large-scale systems. He authored the first formal analysis of the Signal Protocol, helped design the Asynchronous Ratchet Tree precursor to MLS, and co-authored RFC 8937 to harden PRNG usage across TLS/SSH. At Amazon he built an agentic LLM-based security reviewer deployed org‑wide and designed post‑quantum, identity‑hiding protocols for the Leo satellite constellation and consumer devices. Previously he led Meraki’s Secure Development Lifecycle and solved real‑world firmware and protocol vulnerabilities, blending cryptographic theory with pragmatic engineering. Based in New York, he focuses on the intersection of AI and security-critical infrastructure and holds a track record of moving academic advances into standards, patents, and shipped products.
8 years of coding experience
4 years of employment as a software developer
Doctor of Philosophy - PhD Cryptography, Doctor of Philosophy - PhD Cryptography at University of OxfordLondon School of Economics and Political ScienceProgramming languages (2)
Github contributions (5)
ldgarratt/ldgarratt.github.io
Feb 2022 - Jan 2025
Contributions:9 pushes in 2 years 11 months
ldgarratt/shamir
Nov 2021 - Oct 2022
Contributions:14 pushes in 11 months
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