GPT-6 Astra cracks 217-year-old Napoleonic code in six hours
5 hours ago
- GPT-6 Astra deciphered a 217-year-old Napoleonic code in six hours using only a single image and prompt.
- The cipher contained troop orders from Eugène de Beauharnais to General Auguste de Marmont, lost since 1809.
- The decrypted text filled a missing sentence in Napoleon's 1865 memoir, originally breaking off mid-phrase.
- The solution was verified by the maintainer of the Cryptiana Unsolved Historical Ciphers list and is available for download.
- Astra used a partial key and a simulated-annealing solver to crack the 24-row cipher of numbers, letters, and invented symbols.