Four-square cipher. Two plaintext squares (top-left and bottom-right) are the straight alphabet A–Z omitting J. I and J share.
Cipher · Sunday 30 August 2026
This desk has not corrected this file. Corrections.
Cipher · Sunday 30 August 2026
Four-square cipher. Two plaintext squares (top-left and bottom-right) are the straight alphabet A–Z omitting J. I and J share.
This desk has not corrected this file. Corrections.
The paper
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