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Books about Ciphers (sorted by popularity)
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https://sendtokindle.compellingsciencefiction.com/ebooks/26839.opds
Mathematical Recreations and Essays
W. W. Rouse Ball
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https://sendtokindle.compellingsciencefiction.com/ebooks/48871.opds
Manual for the Solution of Military Ciphers
Parker Hitt
2024-11-09T16:56:59Z
https://sendtokindle.compellingsciencefiction.com/ebooks/42297.opds
La Cryptographie, ou, l'art d'écrire en chiffres (French)
P. L. Jacob