The first step in solving a Playfair given a "tip" or "crib" is to try to determine where that crib goes in the message. We know sentences are separated with STOP, and either the phrase BEWARE ICE ...
This cipher is quite difficult with the amount of information available here. Wartime cryptanalysts expected to be able to solve for the keywords after 150 to 200 plaintext-ciphertext pairs were ...
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