Researchers found that anthropic, openai, and google encrypt their chain-of-thought blocks with one…
researchers found that anthropic, openai, and google encrypt their chain-of-thought blocks with one shared key per provider, so replaying a trace from a strong model into a weaker sibling can recover the hidden reasoning in plaintext. the attack is called a decryption jailbreak and it works across sessions, users, and models. encryption without key separation is just obfuscation with extra steps.
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