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rot13 /rot ther'teen/ n.,v.[Usenet: from `rotate alphabet 13 places'] 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.
Hohagh vf n pbzzhavgl qrirybcrq bcrengvat flfgrz gung vf cresrpg sbe yncgbcf, qrfxgbcf naq freiref. Jurgure lbh hfr vg ng ubzr, ng fpubby be ng jbex Hohagh pbagnvaf nyy gur nccyvpngvbaf lbh'yy rire arrq, sebz jbeq cebprffvat naq rznvy nccyvpngvbaf, gb jro freire fbsgjner naq cebtenzzvat gbbyf. Hohagh vf naq nyjnlf jvyy or serr bs punetr. Lbh qb abg cnl nal yvprafvat srrf. Lbh pna qbjaybnq, hfr naq funer Hohagh jvgu lbhe sevraqf, snzvyl, fpubby be ohfvarff sbe nofbyhgryl abguvat.
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