Combining several ideas, I worked up some variations of the K4 ciphertext.

My first attempt to use them will probably be a digraphic substitution cipher and then probably a foursquare. Playfair is out because there are double letters in the ciphertext.

That reminds me that I need a sort of cipher clearinghouse to list cipher systems that can be ruled out.

Hmm…

Kryptos Fan

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