ROT13
Apply the classic ROT13 cipher, rotating each ASCII letter 13 places through the alphabet. Because 13 is half of 26, running it twice returns the original text. A fun way to hide spoilers and puzzle answers.
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Worked example
Uryyb TT
Frequently asked
Is ROT13 secure?
No — it's a toy cipher for obscuring text, not for protecting secrets.
How do I decode it?
Run ROT13 again; it's its own inverse.