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Christian Schroeder de Witt

2 papers indexed

arxivcs.CRcs.LG2026-06-28

Exploring the Cryptographic Limits of Transformer Networks

Stefan Domunco, Andis Draguns, Philip Torr, Isaac Robinson, Christian Schroeder de Witt

In recent work it has been shown that colluding AI agents can use steganographic methods to exchange malicious information. Whether a transformer can implement steganographic methods depends on what cryptographic functions it can implement, since a transformer that can implement…

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arxivcs.CRcs.AI2026-06-25

Tool Use Enables Undetectable Steganography in Multi-Agent LLM Systems

Jimmy Laurence Rippin, Simon C. Marshall, David Demitri Africa, Christian Schroeder de Witt

Increasingly autonomous agentic AI systems pose novel multi-agent risks, such as secret collusion via covert communication channels. The natural defence to these collusion attempts is to monitor plain-text communication, but the efficacy of monitors has been called into doubt by…

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