AI Knows Who You Are: Large-Scale Deanonymization with LLMs and the End of Online Privacy

The talk will consist of three parts. In the first part, I will show with concrete examples how LLMs deanonymize users: the attack pipeline covering feature extraction, candidate search, reasoning, and verification. In the second part, I will evaluate scenarios where this technical capability could be transformed into a tool for systematic surveillance by corporations and governments. In the final part, I will discuss what the free software and open-source community can do to counter this threat — at the level of privacy-focused tools, data minimization, and platform design.