+++ title = "Pernicious numbers" description = "" date = 2019-09-10T18:35:58Z aliases = [] [extra] id = 17363 task = """ A pernicious number is a positive integer ...
The Playfair cipher is a classical digraph substitution cipher that was created by Charles Wheatstone in 1854. The cipher was named after its advertiser, Lord Playfair. It's called a digraph ...
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