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I have tried and think that I’ve done the first part of it however I can’t find a way to finish it off. Will there be any hints before the first deadline?
[Post again with more details of what you have done, and I will see if there is something useful I can say. We don’t usually give hints before the first deadline though. Harry]
[OK, read that. I can’t say much, but you are on the right track, and it should just take some concentrated effort! Harry]
Yes! Finally got it. Surprisingly, 7B was easier than I’d thought it to be. Initially had some confusion but figured it out eventually.
If anybody needs some cribs for 7A then this case file image may be quite useful: https://2020se.cipherchallenge.org/wp-content/uploads/2020/05/hs2-185-enlarge.jpg
Harry I am stuck on part B I have worked out that it is [Edited by Harry] but cant work out the [Edited by Harry] part. Could you give a clue as to what type of [Edited by Harry] it is?
[I am afraid I can’t, but you are doing well! Keep going. Harry]
Why is everyone talking about the final sentence of 7A? it reads: ‘I leave it to you to decipher.’ I don’t see anything wrong with that or how that could be used as a clue. Harry please help!
[I think they mean the penultimate sentence! Harry]
Harry, please could you explain how two different ciphers could be used in combination?
[Sure: To make it harder to break the message you first encode it with one cipher, then encode the result with a different one. If you did that using two Caesar shift ciphers you would end up with the same thing as a single Casesar shift (shift by 3, then shift by 4 is the same as shift by 7) so that is no good. Enciphering twice with a keyword cipher is also the same thing as a single encryption, though usually by a rather complicated keyword. Using a transposition cipher and then another one would also just be the same as using a single transposition cipher. BUT, if you combine some form of substitution with some form of anagramming, you get something nastier! Good, huh? Harry]
Amazing puzzle Harry really enjoyed doing 7A, however after deciphering the […] cipher on 7B to get an expected monogram frequency, the next cipher to decipher is unwilling to produce anything readable. I have a feeling I’m going on the complete wrong track.
Yes, please may we have a hint, Harry?
I cannot believe this. Even I who wrecked her brain for 6 days on 6B, could do 7B in less than 10 minutes, the biggest hint is that 7B (and 7A) are rather easy for Challenge 7.
@Madness Ha! Another leader whose name was spelt incorrectly! Maybe we should address our glorious keymaster as “Hrarny” from now on?
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