Simple Caesar cipher with special characters. Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.
["<String> encrypt/decrypt", "<String> input", <int> key]
["encrypt", "American Standard Code for Information Interchange", 24]
["decrypt", "Y+#0'!Y,X12Y,\"Y0\"X!-\"#X$-0X',$-0+Y2'-,X',2#0!&Y,%#", 24]