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{{Short description|Simple encryption method}}
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Because there are 26 letters (2×13) in the [[ISO basic Latin alphabet|basic Latin alphabet]], ROT13 is its own [[inverse function|inverse]]; that is, to undo ROT13, the same [[algorithm]] is applied, so the same action can be used for encoding and decoding. The algorithm provides virtually no [[cryptography|cryptographic]] security, and is often cited as a canonical example of [[weak encryption]].<ref name=modern-cryptanalysis>{{cite book |title=Modern Cryptanalysis: Techniques for Advanced Code Breaking |author=Christopher Swenson |page=5 |publisher=John Wiley & Sons |date=17 March 2008 |isbn=978-0-470-13593-8 |url=https://books.google.com/books?id=oLoaWgdmFJ8C&pg=PA5 |access-date=5 October 2015 |archive-date=24 June 2016 |archive-url=https://web.archive.org/web/20160624151537/https://books.google.com/books?id=oLoaWgdmFJ8C&pg=PA5 |url-status=live }}</ref>
ROT13 is used in [[online forum]]s as a means of hiding [[spoiler (media)|spoiler]]s, [[punch line|punchlines]], puzzle solutions, and [[profanity|offensive material]]s from the casual glance. ROT13 has inspired a variety of letter and word games online, and is frequently mentioned in [[newsgroup]] conversations.
==Description==
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