A simple letter substitution cipher used in Hebrew texts where the first letter of the alphabet is replaced with the last, the second with the second-to-last, and so on.
From Hebrew aleph-tav-bet-shin, the first and last letters of the Hebrew alphabet mentioned in the system. An ancient encryption method documented in biblical texts and rabbinical literature.
The Atbash cipher is basically a DIY medieval encryption system—it's so simple a child could decode it in minutes, yet ancient scribes used it to hide religious and political meanings in sacred texts.
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