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Rotational Ciphers

Rotation ciphers have a long history, a famous example being the Caesar Cipher (also Caesar’s code or Caesar’s shift), a substitution cipher used to encode messages by substituting letters by other letters a fixed number of positions away in alphabetic location.

Double-encoding ROT13 results in a shift of 26, which is exactly the the original message and is the same as no encoding. This is often humorously termed 2ROT13 or ROT26.

Decrypting a rotationally encrypted message requires no key. It only requires the knowledge that rotational substitution is being used.

Interesting Words in ROT13

Original WordROT13 encrypted
ant nag
balk onyx
bar one
barf ones
be or
envy rail
flap sync
fur she
gel try
gnat tang
irk vex