The Rotation or "ROT" system of coding is based on a
simple substitution cipher.
It uses familiar letters, but shifts them forward or backward in the alphabet, replacing the starting letter with the shifted one. For example, the ROT-1 technique shifts letters by one slot, meaning "A" becomes "B," "B" becomes "C," etc. But if you want to ratchet things up a few notches, you can use ROT-13, by which you move your intended letter thirteen positions in the alphabet and voila! You've got your replacement letter. Since "A" is the first letter in the alphabet, shifting it 13 spaces would yield "N." Sliding 13 slots from "B" would give you "O," and so on and so forth. Still confused? Here's a handy key for you:
As you can see, the ROT-13 system is reciprocal; "K" becomes "X" and "X" becomes "K," for instance. However, if you use a different ROT base number, you'll encounter an entirely different language altogether. You and your pals can use any number between 1 and 26, just make sure you're on the same page or there will be some major miscommunications on the horizon!