World 1 · Substitution · 5 minAtbash: the mirrored alphabet
A becomes Z, B becomes Y
Teaching this? Open projector mode
Atbash writes the alphabet backwards under itself: A↔Z, B↔Y, C↔X, and so on. It comes from the Hebrew alphabet, and scholars have found it in the Book of Jeremiah.
Like ROT13 it has no key, and it undoes itself: mirror a mirror and you are back where you started.
Check yourself
In Atbash, what does M become?
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