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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 Word |
ROT13 encrypted |
|
| ant |
nag |
|
| balk |
onyx |
|
| bar |
one |
|
| barf |
ones |
|
| be |
or |
|
| envy |
rail |
|
| flap |
sync |
|
| fur |
she |
|
| gel |
try |
|
| gnat |
tang |
|
| irk |
vex |
|