06/09/2026

Route Transposition Ciphers during the US Civil War Solved by using AI

Two undecoded telegrams to Union General Milroy were solved by Richard Bean, who had Claude Opus 5 solve them. While there are many papers about codebreaking with AI (see my blogpost for some), this is the first case that I see commonly available generic AI solve a real historical cryptogram.

I note the transposition route is the same as that of Stager Cipher No.7 albeit with a different number of lines. I uploaded a new article "Stager Cipher No.7 Continued in Use after Abandonment" about this.

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