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National Cipher Challenge 2019 › Forums › National Cipher Challenge 2019: Countdown to Catastrophe › Hint before challenge ends
Would you be so kind as to put up a less around the Bush hunt as to how to solve 7B please, I’m really struggling and would like to learn how to solve this type of cipher
OK, the text in 7B is arranged in a square because it should be read in columns not rows! Once you know that then you can carry out a straightforward analysis. Frequency checks on individual characters shows the distribution is a bit flat for a monoalphabetci substitution, so it is probably poyalphabetic, and this is indeed a Vigenere cipher. You can use the Index of Coincidence to try to find the period of that Vigenere, and then crack it as usual. Does that help?
Got it finished just in time
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