What I found interesting, (along with the entire story about Sherlock Holmes) was that the block cipher method made genuine sense to me, being able to invert matrices seems to have finally come in handy. It also makes sense how it is so much harder to use frequency analysis because of how changing on letter of plaintext will manipulate a much larger portion of cipher text than with other ciphers that we have been using.
The hard part of this reading was understanding how someone would break the adfgx cipher without the keyword. The book just said if you know the keyword then its easy. But don't we only assume that they know the method not the key? It seems like without that, that it would be difficult to come to any kind of conclusion. I guess that is why they thought it was strong at the time.
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