Homepage: https://www.gnu.org/software/emacs
Author: Howard Gayle, Simon Josefsson
Display a buffer in ROT13
"ROT13 ('rotate by 13 places') is a simple letter substitution
cipher that replaces a letter with the 13th letter after it in
the alphabet. ROT13 is a special case of the Caesar cipher
which was developed in ancient Rome.
Because there are 26 letters (2×13) in the basic Latin
alphabet, ROT13 is its own inverse; that is, to undo ROT13, the
same algorithm is applied, so the same action can be used for
encoding and decoding. The algorithm provides virtually no
cryptographic security, and is often cited as a canonical
example of weak encryption.
ROT13 is used in online forums as a means of hiding spoilers,
punchlines, puzzle solutions, and offensive materials from the
casual glance." - Wikipedia article on ROT13
The entry points, `rot13', `rot13-string', and `rot13-region' performs ROT13
encoding/decoding on buffers and strings. The entry point
`rot13-other-window' performs a ROT13 encoding/decoding on the current
buffer and displays the result in another window.