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30 different digrams?  Go to the Training: Crypto - Digraphs challenge

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30 different digrams?
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I don't get it - the description says there are 26 letters used. But I get 30 different digrams if I analyze the ciphertext. How can be 4 digrams mapped? Is it upper case? I assume yes, because the description also says the text is in "correct case". But then we have (26*2)^2 different possibilities, don't we?
Last edited by Smasher - Jan 03, 2016 - 04:41:53
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RE: 30 different digrams?
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The question says:
"The message [...] is written with correct case and punctuation."
so you can have 2*26 plus some special chars.
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