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Carter Church has Astra decode a 217-year-old Napoleonic cipher letter and spot a dating error

Given a scan of an encrypted letter sent to one of Napoleon's generals 217 years ago, Astra transcribed about 1,300 cipher symbols, found a partial historical key, built a solver for the rest, decoded the letter, and noticed the original date was wrong.

Ryan Orhan
@rynorhnArchived 2026.10.02Originally posted 2026.10.01
Carter Church has Astra decode a 217-year-old Napoleonic cipher letter and spot a dating error
Ryan Orhan @rynorhnOriginally posted 2026.10.01
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this is so fucking cool. carter church gave gpt-6 astra a scanned image of a 217-year-old encrypted letter sent to one of napoleon’s generals. six hours later it had transcribed ~1,300 cipher symbols, found a partial historical key, built a solver for the rest and decoded the letter. and while doing it, it figured out the fucking letter had been dated incorrectly. what an insane time to be alive.

This post quotes another post: “GPT-6 Astra decrypts a 217-year-old cipher to one of Napoleon's generals”

x.com/rynorhn/status/2105565405544603922Archived 2026.10.02 10:06