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GPT-6 Astra autonomously broke an unbroken Enigma message, Nr. 172 (MVUEH), from Crypto Cellar Research. Directed by Carter Leffer, it identified the message, linked it to Nr. 173 (SIPVX), and used the repeated place name ROSENOW ROSENOW as a crib. It built its own Enigma simulator and Bombe in Python and C++, then recovered the correct key and plaintext.
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