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/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