rot13

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rot13

/rot ther'teen/ [Usenet: from "rotate alphabet 13 places"], v. The simple Caesar-cypher encryption that replaces each English letter with the one 13 places forward or back along the alphabet, so that "The butler did it!" becomes "Gur ohgyre qvq vg!" Most Usenet news reading and posting programs include a rot13 feature. It is used to enclose the text in a sealed wrapper that the reader must choose to open - e.g. for posting things that might offend some readers, or spoilers. A major advantage of rot13 over rot(N) for other N is that it is self-inverse, so the same code can be used for encoding and decoding.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

rot13

A simple cryptography system that substitutes each letter with the 13th letter down the alphabet, rotating back to the beginning. The algorithm that encodes also decodes, because there are 26 letters in the alphabet. It is used to keep messages from the casual observer.
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8Da followed YESTERDAY'S SOLUTIONS WEE THINKER ACROSS: 7 Canvass 9 Appal 10 Plonk 11 Coppers 12 Rot 13 Senorita 16 Dog roses 17 Eat 19 Iceberg 21 On tap 22 Bombe 23 Tunisia DOWN: 1 Sceptre 2 One or two 3 Rank 4 Vampires 5 Epee 6 Plush 8 Second sight 13 Sorcerer 14 Treatise 15 Stopgap 18 Limbo 20 Emma 21 Owns QUICKIE ACROSS: 1 All together 8 Duo 9 Yes 11 Insipid 12 Tweet 13 Ate 14 Ski 15 Covered 17 Yet 19 Else 21 Afar 23 Zone 25 Sago 27 Gas 29 Reunite 31 Egg 34 Spy 36 Aroma 37 Renewal 38 Kin 39 Ivy 40 Text message DOWN: 1 Aunt 2 Lose 3 Tapioca 4 Gadget 5 Title 6 Eyes 7 Reek 8 Diary 10 Stile 16 Den 18 Tag 20 Leg 22 For 24 Outings 25 Steak 26 Untrue 28 Shyly 30 Exact 32 Grit 33 Gone 34 Swig 35 Pave