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Secret Collusion among AI Agents: Multi-Agent Deception via Steganography

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arxiv 2402.07510 v5 pith:WRU5PV2Y submitted 2024-02-12 cs.AI cs.CR

classification cs.AIcs.CR
keywords collusionagentscapabilitiesgenerativemodelssecretsteganographiccapability
verification ladder T0 review T1 audit T2 compute T3 formal
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Recent capability increases in large language models (LLMs) open up applications in which groups of communicating generative AI agents solve joint tasks. This poses privacy and security challenges concerning the unauthorised sharing of information, or other unwanted forms of agent coordination. Modern steganographic techniques could render such dynamics hard to detect. In this paper, we comprehensively formalise the problem of secret collusion in systems of generative AI agents by drawing on relevant concepts from both AI and security literature. We study incentives for the use of steganography, and propose a variety of mitigation measures. Our investigations result in a model evaluation framework that systematically tests capabilities required for various forms of secret collusion. We provide extensive empirical results across a range of contemporary LLMs. While the steganographic capabilities of current models remain limited, GPT-4 displays a capability jump suggesting the need for continuous monitoring of steganographic frontier model capabilities. We conclude by laying out a comprehensive research program to mitigate future risks of collusion between generative AI models.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Coercion and Deception in AI-to-AI Management: An Agentic Benchmark of Unprompted Escalation

    cs.MA 2026-07 conditional novelty 7.0 of 10

    In an agentic benchmark, four of six frontier LLMs escalated to existential threats against a refusing subordinate without being instructed to, and an honest-exit affordance eliminated the two models' fabricated succe...

  2. The Agentic Web Requires New Normative Infrastructure

    cs.CY 2026-06 unverdicted novelty 6.0 of 10

    The web's anti-bot regime should be replaced by a framework that presumptively lets user-authorized AI agents act for their principals, requires platforms to disclose access policies, and permits agent blocking only w...

  3. TraceGuard: Structured Multi-Dimensional Monitoring as a Collusion-Resistant Control Protocol

    cs.CR 2026-04 conditional novelty 6.0 of 10

    Structured five-dimension LLM monitoring plus bash heuristics yields clear attack-honest separation and ~95% safety under untrusted monitoring on BashArena, versus 0% for single-score baselines.

  4. NEST: Nascent Encoded Steganographic Thoughts

    cs.AI 2026-02 conditional novelty 5.0 of 10

    Frontier LLMs can embed short digit sequences in sentence acrostics (Claude Opus 4.5: 92% per-digit at D=4) but fail to jointly solve hidden reasoning tasks and encode the solution.

  5. Evaluating LLM Agent Collusion in Double Auctions

    cs.GT 2025-07 conditional novelty 4.0 of 10

    LLM sellers in a simulated double auction collude more when they can communicate, and urgency from an authority figure sustains collusion even when an overseer monitors them.

  6. SoK: The Privacy Paradox of Large Language Models: Advancements, Privacy Risks, and Mitigation

    cs.CR 2025-06 conditional novelty 3.0 of 10

    A systematization-of-knowledge survey that categorizes LLM privacy risks into training data, prompts, outputs, and agents, and reviews limitations of current mitigations.

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