Carter Leffen, a product development coach at Bloomberg LP, successfully decrypted an 82-character radio message sent by a German soldier in 1941. The message, which remained unsolved for 83 years, was encrypted using an Enigma machine and was originally archived under the tag MVUEH.
The decryption process utilized the GPT-6 Astra Extra High model and specialized AI agents. The system spent approximately ten hours performing tasks including historical research, Enigma simulator development, cryptanalysis code writing, and parallel key testing.
The breakthrough occurred after researchers identified the town name Rosenow in a previously decrypted message from the same day. By applying this term and leveraging the Enigma machine's inability to encrypt a letter as itself, the team identified the correct machine settings.
The resulting text contained phrases requesting march instructions and an immediate radio reply, along with operator-specific typos. Leffen noted that the effort required to document the solution and build the project website significantly exceeded the time spent on codebreaking.
The project materials, including the code, search data, and a 3D Enigma simulator, are available for public download. The findings are based on prior cryptanalytic work by Frode Weierud, Geoff Sullivan, and Olaf Ostwald, and await further independent expert review.
