It uses the QWERTY Keyboard, and for each letter, you go one to the right.
For example:
Q=W
E=R
V=B
and so on. When you use a letter on the end of the row, it loops back to the beginning. so,
P=Q
L=A
M=Z
And to translate it back, you just go one to the left. Simple, but very handy for secret messages
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