Codebreaking through logical reasoning would be the most exciting topic for crypto-enthusiasts. But breaking code, as opposed to cipher, cannot be achieved by techniques such as letter frequency analysis. I'm collecting specimens of breaking codes in "How to Break a Code (Not a Cipher)".
I now added a specimen of solving a Peruvian diplomatic code (1926) described by Yardley.
I added another example from Langie (English).
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