It's part of Un*x folklore, from Ken Thompson when asked what he might have done differently: Xra Gubzcfba jnf bapr nfxrq jung ur jbhyq qb qvssreragyl vs ur jr

It's part of Un*x folklore, from Ken Thompson when asked what he might have done differently: Xra Gubzcfba jnf bapr nfxrq jung ur jbhyq qb qvssreragyl vs ur jrer erqrfvtavat gur HAVK flfgrz. Uvf ercyl: "V'q fcryy perng jvgu na r." Found here: https://en.wikiquote.org/wiki/Ken_Thompson https://en.wikiquote.org/wiki/Ken_Thompson