ROT13 has been the subject of many jokes.

The 1989 International Obfuscated C Code Contest (IOCCC) included an entry by Brian Westley. Westley's computer program can be encoded in ROT13 or reversed and still compiles correctly. Its operation when executed is either to perform ROT13 encoding on, or to reverse, its input.

In December 1999, it was found that Netscape Communicator

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