[split] Diplomatic ciphers

[Mark Knowles]

JKP: Tell me about other ciphers of the period that you are aware of that are homophonic, use nulls, have a glossary, use letter pair mapping and any other features we see in diplomatic ciphers. There are substitution ciphers and there are substitution ciphers, saying we are just talking about substitution ciphers doesn't cover the specific kinds of substitution features.

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JKP: Ok, as usual you would have saved me a lot of time in the first place if you had not commented given that you did not want to give it any attention.