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Napoleon's 217-Year-Old Mysterious Letter Cracked Using AI In 6 Hours

An AI researcher from SentinelOne used GPT-6 Astra to decode a 217-year-old coded military message from the Napoleonic era in six hours. The letter was originally sent in March 1809 by Eugene, the Viceroy of Italy and stepson of Napoleon Bonaparte, to French general Auguste de Marmont during France's conflict with Austria. The message had remained mysterious for over two centuries because the original cipher key was lost.

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  • ✓ AI decoded a 217-year-old coded message from Napoleon's era in six hours.
  • ✓ The message remained mysterious for 217 years because its cipher key was lost.
🛡️ Source Corroboration: 8 independent reporting domains (80% confidence) ⏱ Read time: ~2 min

What changed

A SentinelOne researcher utilized GPT-6 Astra to solve a cipher that remained unread for 217 years.

Live updates

  1. AI decodes 217-year-old Napoleon cipher in six hours

    An AI researcher from SentinelOne used GPT-6 Astra to decode a 217-year-old coded military message from the Napoleonic era in six hours. The letter was originally sent in March 1809 by Eugene, the Viceroy of Italy and stepson of Napoleon Bonaparte, to French general Auguste de Marmont during France's conflict with Austria. The message had remained mysterious for over two centuries because the original cipher key was lost.

    Why it matters

    The ability to crack historical ciphers using modern AI demonstrates the speed of current linguistic processing compared to traditional cryptanalysis. This specific letter dates back to the Napoleonic Wars, a period of intense European conflict.

    What is confirmed

    • AI decoded a 217-year-old coded message from Napoleon's era in six hours.
    • The message remained mysterious for 217 years because its cipher key was lost.

    Still unconfirmed

    • The letter was sent by Eugene, the Viceroy of Italy, to general Auguste de Marmont in March 1809 during a conflict with Austria.
    • A SentinelOne AI researcher used GPT-6 Astra to crack the cipher.

    What to watch next

    • Publication of the decoded text of the letter
    • Verification of the decryption by independent historians
    • Details on the specific AI prompts or methods used to break the cipher
    Sources used for this update (10)
    1. The Telegraph — Napoleon’s 217-year-old coded message ‘cracked by AI’
    2. The Times — Napoleon’s centuries-old code cracked by AI in six hours
    3. NDTV — Napoleon's 217-Year-Old Mysterious Letter Cracked Using AI In 6 Hours
    4. calcalistech.com — SentinelOne AI researcher uses GPT-6 Astra to crack Napoleon cipher after 217 years
    5. Euronews.com — AI decodes 217-year-old Napoleonic letter in 6 hours
    6. timesofindia.indiatimes.com — In 1809, Napoleon Bonaparte sent a coded message to his general; it remained mysterious for 217 years unt....
    7. timesofindia.indiatimes.com — Numerology horoscope today, October 04, 2026: What your name's first letter reveals today
    8. www.dailymail.com — Napoleon's code is cracked after 217 years: Scientist uses AI to read a mysterious letter written by the ....
    9. nypost.com — Napoleon's secret code deciphered after 217 years using AI
    10. www.dailymail.com — Ancient Egyptian 'gateway to the underworld' discovered inside remarkable Roman pyramid tomb
    confidence 80%
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