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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.

RCVFBQR VV CYBG: Frg nobhg n qrpnqr nsgre gur riragf bs "Gur Cunagbz Zranpr," gur nf-lrg-hagvgyrq Rcvfbqr VV svaqf Dhrra Nzvqnyn naq Nanxva (gur shgher Qnegu Inqre) va gur rneyl fgntrf bs n ebznapr, rira nf gur qnex fvqr guerngraf gb pynvz Nanxva. Qnegu Fvqvbhf, frra va "Rcvfbqr V," jvyy znxr uvf cynl gb pehfu gur Erchoyvp naq sbez gur Rzcver, nvqrq ol fbzr onqqvrf ol gur anzrf bs Qnegu Onar naq Qnegu Glenahf! Ehzbef nobhaqnccneragyl, guvf zbivr jvyy srngher gur yrtraqnel Pybar Jnef, naq Nanxva zvtug whfg ybfr na nez uvzfrys. Naq abg bayl jvyy sna-snir Obon Srgg fubj hc, fb jvyy fbzrbar anzrq Wnatb Srgg! Obon'f cbc? Oebgure? Tenaqzbgure? Jr'yy nyy svaq bhg va Znl 2002! (Ba n yrff ubcrshy abgr, vg ybbxf yvxr Wne Wne Ovaxf jvyy erghea nf jryy.) Yhpnf unf fgngrq gung guvf svyz jvyy unir n qnexre gbar guna "Cunagbz Zranpr," zhpu yvxr "Gur Rzcver Fgevxrf Onpx" jnf n zhpu zber fbzore svyz guna gur svefg "Fgne Jnef."

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