OpenAI's GPT-6 Astra decrypts a Nazi radio message in ten hours that went unsolved for 83 years
A Bloomberg developer used OpenAI's GPT-6 Astra to decrypt an 83-year-old Enigma-encrypted 1941 Wehrmacht radio message in about ten hours.
Carter Leffen, a product development coach at Bloomberg LP, used OpenAI's GPT-6 Astra 'Extra High' and multiple AI agents to decrypt an 82-character Enigma-encrypted 1941 radio message, tagged MVUEH, that had been unsolved for 83 years. The model spent roughly ten hours searching archives, building an Enigma simulator, writing cryptanalysis code, and testing competing keys; the breakthrough came from the town name 'Rosenow' appearing in a same-day decrypted message. The decrypted text contains operator typos supporting authenticity, and verification packages plus a 3D Enigma simulator are published, pending independent expert review.
- GPT-6 Astra worked about ten hours across archive research, simulator building, and parallel key testing.
- The breakthrough leveraged the town name 'Rosenow' and Enigma's weakness of never encrypting a letter as itself.
- The 82-character 1941 message is a soldier's request for marching orders; typos like 'BTTE' suggest authenticity.
- All code, search data, and a working 3D Enigma simulator are available on the project page.
- Historical identity and uniqueness of the solution still await independent expert evaluation.
- Vendors
- OpenAI
- Products
- GPT-6 Astra
- Victims
- Bloomberg
- AI models
- GPT-6 Astra
From the original article
3 min read at the-decoder.com
A Bloomberg developer claims to have cracked an 83-year-old Enigma message from the Wehrmacht using OpenAI's GPT-6 Astra. The 82-character radio message from 1941 contains a soldier asking about his march route. The solution still needs independent review.
By Matthias Bastian · the-decoder.com
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