# Large-scale Online Deanonymization with LLMs

> Researchers from MATS, ETH Zurich, and Anthropic show that an LLM pipeline achieves 68% recall at 90% precision re-identifying pseudonymous users - compared to near 0% for all prior methods. Practical obscurity no longer holds.

Canonical URL: https://kravhal.kcsatish.com/insights/week-12
Edition: Week 06 · April 2026
Tags: LLMs, Security, Privacy
Reading time: 16 min read

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