AI Successfully Decodes Long-Unscrambled Enigma Message from 1941

Sep 22, 2026

AI Summary

An AI model, GPT-6 Astra, has successfully decoded the German Army Enigma message MVUEH, which had remained unsolved since 2005. The breakthrough was achieved by analyzing related messages and utilizing advanced simulation techniques, demonstrating the AI's capabilities in cryptanalysis.

On September 15, 2026, Carter Leffer sought validation for the decryption of the Enigma message MVUEH from July 10, 1941, which had resisted attempts to break it since 2005.
The MVUEH message was logged by the SS-Totenkopf Quartiermeister and is 82 letters long, with a key that differs from other messages from the same day.
Previous attempts to decode related messages, such as SIPVX, had been unsuccessful due to differences in the Enigma keys used.
GPT-6 Astra independently identified MVUEH as a promising target and utilized the repeated place name ROSENOW as a crib to aid in the decryption process.
The AI developed software for simulating the Enigma machine and successfully found the correct key and plaintext for the MVUEH message.
The analysis of the decryption process revealed errors in the original transcription of the ciphertext and noted a rare turnover in the Enigma's left-hand wheel, which complicated earlier attempts.
GPT-6 Astra's performance in breaking the message has been likened to that of a professional cryptanalyst, achieving results in days that would typically take humans weeks or months to accomplish.

openaigpt-6encryptionmachine learningnatural language processing

AI Successfully Decodes Long-Unscrambled Enigma Message from 1941

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