GPT-6 Astra Breaks an Old Enigma Message

GPT-6 Astra, an advanced AI model, independently decrypted a long-unbroken Enigma message (a WWII-era encryption system) by analyzing historical encrypted messages, identifying a promising target, and developing its own cryptanalysis software including an Enigma simulator and Bombe machine (a device that systematically tests encryption keys). The AI successfully found the correct decryption key and plaintext for message Nr. 172 (MVUEH) by using a repeated phrase as a crib (known plaintext that helps break an encryption).