ROT13 is a special case of a Caesar substitution cipher where each character is replaced by a character 13 places later in the alphabet.
ROT13 is a term that connote the act or "rotate by 13 places". It can also be hyphenated as ROT-13.
This is a kind of letter substitution cipher that stand in place of a letter with the 13th letter after it in the known alphabet. ROT13 is said to be a unique case of the Caesar cipher which was created in ancient Rome.
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