The German Enigma ciphertexts that remained unsolved for 85 years were cracked by GPT-6 Astra in just 10 hours.
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Insight: Beating AI News Flash – Carter Leffen, a product developer at Bloomberg, used GPT-6 Astra to crack a 1941 German Wehrmacht Enigma ciphertext. Leffen is not a cryptographer. The 82-letter ciphertext had long been marked as unsolved by cryptography history archive CryptoCellar. Astra Extra High took roughly 10 hours to derive the solution. The key clue came from another already decrypted telegram sent the same day: Astra noticed the place name “ROSENOW” appearing twice in a row, then hypothesized the same word was hidden in the target ciphertext. It then built an Enigma simulator and search program, tested different keys in parallel, and verified results against the original telegram header and remaining text. The final decrypted message was simple: “Please inform the marching route. I am in Rosenow. Please reply immediately via radio.” That said, the achievement was not solely dependent on Astra: Leffen set the investigation goal and led the process, while Astra handled most of the research, coding, search runs, and verification tasks.
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