Caesar Cipher in F# and Haskell

The roman empire Julius Caesar (100 B.C - 44 B.C) used very simple encipher method to communicate with troops. This method substitutes each alphabet of a word with an alphabet from certain position further in alphabet system. If we use displacement-length 2 for the word “apple”,we will get “crrng”. This cipher method is very easy to crack because we have to check only 25 combinations and every language has characteristic distribution for its alphabets, just like finger print.
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