[sparklite2]

The writer is correct - once you break a code system you can then “read” any and all mails using that code.

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That is true for simple substitution codes. No one uses simple substitution past “Drink Ovaltine” cryptography.

[sparklite2]

Actually, you’re correct as systems go. But look what it took to break Enigma. It’s more than working with pen and paper.