GPT-6 Astra Breaks an Old Enigma Message

Summary

Carter Leffer directed GPT-6 Astra to try breaking unbroken Enigma messages published on the Crypto Cellar Research web page. The model chose message Nr. 172 (MVUEH), suspected it was related to Nr. 173 (SIPVX), and used the repeated place name ROSENOW ROSENOW as a crib. It wrote its own Python and C++ Enigma simulator and Bombe, and the break produced the correct key and plaintext for MVUEH.

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