Cabinet Noir
>Decode / ROT13
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A fixed shift of 13 — its own inverse: applying it twice restores the text. Obfuscation, not encryption.
Type
substitution cipher
Breaking it
trivial to break
Era
1980s
Name
Popularised on Usenet newsgroups to hide spoilers and punchlines.
Modes
encrypt · decrypt
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Tool
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Message
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Created by Denys Grybov in 2021
v.0.4.0 // released on 18.10.2026