This series covers the Strachey Lectures, a series of termly computer science lectures named after Christopher Strachey, the first Professor of Computation at the University of Oxford.
Hosted by the Department of Computer Science, University of Oxford, the Strachey Lectures began in 1995 and have included many distinguished speakers over the years. The Strachey Lectures are generously supported by OxFORD Asset Management.
Trinity Term 2026 Strachey Lecture with Professor Srđan Čapkun, Hardening Digital Infrastructure: Resilient Positioning and Sovereign Smartphone Architectures. Recent global events have underscored how failures in isolation, redundancy, and control can jeopardiseessential digital functions. A critical challenge remains: how do we harden systems for higher resiliency, personal and societal control while maintaining compatibility with existing ecosystems? In this talk, I explore this in two example settings.
First, I address the systemic vulnerabilities of current satellite positioning systems. By integrating novel protocols hardened at the physical layer, I demonstrate a path toward a robust, feature-rich, wide-area positioning infrastructure.
Second, I introduce a novel security architecture that brings true digital sovereignty to the modern smartphone. This deployable design allows users to run 'several phones in one' (e.g. isolating private and business environments), ensuring that sensitive applications and critical I/O remain protected even if the underlying OS is compromised. Ultimately, these designs return control to users and organisations, fostering a more resilient and free environment for digital innovation.
26 Feb 2026
An AI stack: from scaling AI workloads to evaluating LLMs
Hilary Term 2026 Strachey Lecture with Professor Ion Stoica, An AI stack: from scaling AI workloads to evaluating LLMs Large language models (LLMs) have taken the world by storm, enabling new applications, intensifying GPU shortages, and raising
concerns about the accuracy of their outputs. In this talk, I will present several projects I have worked on to address these
challenges. Specifically, I will focus on Ray, a distributed framework for scaling AI workloads, vLLM and SGLang, two
high-throughput inference engines for LLMs, and LMArena, a platform for accurate LLM benchmarking. I will conclude with key
lessons learned and outline directions for future research.
27 Oct 2025
Advances in Garbled Circuits
MT25 Strachey Lecture - Professor Rafail Ostrovsky: Advances in Garbled Circuits Nearly 40 years ago, Andy Yao proposed the construction of “Garbled Circuits,” which had an enormous impact on the field of secure computation -- both in theory and in practice. In Garbled Circuits, two parties agree on a Boolean circuit that they want to evaluate, where both parties have partial, disjoint inputs to the circuit, and neither party is willing to disclose to the other party anything but the output. In this talk, I will survey the state of the art for garbling schemes, including computing with Garbled Random Access Memory, the so-called GRAM constructions that were invented by Lu and Ostrovsky in 2013, as well as more recent progress, including the GRAM paper by Heath, Kolesnikov and Ostrovsky, which received the best paper award in Eurocrypt 2022. I will also discuss Garbled Circuits in the malicious setting, where parties try to deviate arbitrarily from the prescribed protocol execution to gain additional information, and will review some of the latest advances in this area. The talk will be self-contained and accessible to the general audience.
Who has been a guest on Strachey Lectures
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Christel Baier
Lise Getoor
Professor Alan Garfinkel
Leslie Kaelbling
Éva Tardos
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