An AI model called GPT-Astra successfully decoded a 108-year-old encrypted German WWI radio message for the first time, revealing information about Allied naval movements near Sevastopol in November 1918. The message, which used the ADFGVX cipher method, was solved using the keyword 'TRUPPENVERSCHIEBUNG' and verified against historical military records.
GPT-6 Astra successfully decoded a previously unsolved German WWI radio message encrypted with the ADFGVX cipher method, revealing information about an English cruiser arriving at Sevastopol on November 24, 1918, and an allied squadron following on November 26. The decryption used the key "TRUPPENVERSCHIEBUNG," which historical records suggest was not officially adopted until December 9, 1918, explaining why the message had remained unsolved.