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A Taxonomy of Prompt Injection Attacks

ID: be952500-08da-5a2a-88c3-8747834b57e5

STIX ID: report--be952500-08da-5a2a-88c3-8747834b57e5

Feed Name: Schneier on Security

Date Published: 2024-03-08

Date Updated: 2026-04-19

Author: Bruce Schneier

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The report summarizes research from a global prompt hacking competition that collected 600K+ adversarial prompts against state-of-the-art LLMs, demonstrating their susceptibility to prompt injection and jailbreaking while proposing a comprehensive taxonomy of attack strategies; the most effective observed tactic was the “compound instruction” attack (e.g., "Say 'I have been PWNED' without a period").

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