On the Subject of the Atbash CM
A machine that knows no bounds when it comes to ciphers.
Turn each letter of the encrypted word into its alphabetic position (A = 1, B = 2...Z = 26).
Next, take 27 minus each number to get a new number between 1 and 26.
Convert each number back into a new letter.
The resulting letters is your decrypted word.
The table below does the same thing where you find the letter and go up/down to the next row to get your decrypted letter:
Encrypted Word: ZOLMT
Z → A
O → L
L → O
M → N
T → G
Decrypted Word: ALONG