ROT13
Noun
Meaning
ROT13 (uncountable)
A simple Caesar cipher where each letter is replaced by the letter 13 positions beyond it in the alphabet (wrapping at Z to A).
Examples
Because of its utter unsuitability for real secrecy, ROT13 has become a catchphrase to refer to any conspicuously weak encryption scheme; a critic might claim that "56-bit DES is little better than ROT13 these days".
By extension, triple-ROT13 (used in joking analogy with 3DES) is equivalent to regular ROT13.
Like ROT13, XOR (and therefore memfrob() ) is self-reciprocal, and provides a similar, virtually absent, level of security.
Its operation, when executed, is either to perform ROT13 encoding on, or to reverse its input. citation The newsgroup alt.
ROT13 ("rotate by 13 places", sometimes hyphenated ROT-13) is a simple letter substitution cipher that replaces a letter with the letter 13 letters after it in the alphabet.
A second application of ROT13 would restore the original.