Atbash cipher - decoder, solver and encoder

The Atbash cipher is a simple substitution cipher, where each letters is replaced by its equivalent in a reverse alphabet. For example, in the English alphabet, A becomes Z, B becomes Y, etc. Atbash was originally used for encrypting the Hebrew alphabet, but the method can be used with any alphabet.

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Decode Atbash cipher

Note that you can type in either the ciphertext or plaintext area.

Decryption/encryption settings



  • The Atbash cipher is a simple form of monoalphabetic substitution cipher.
  • It is formed by taking the alphabet and mapping it to its reverse. For example, in the English alphabet, A becomes Z, B becomes Y, etc.
  • The Atbash cipher was originally used to encrypt the Hebrew alphabet. It got its name from the Hebrew letters Aleph–Taw–Bet–Shin.
  • Atbash cipher encryption and decryption is equivalent. If you encrypt a text twice, it becomes the original text again.

Atbash cipher, and variants of it, are often used in easy geocaching mystery caches, and easy logic puzzles. It can easily be detected using letter frequency analysis of the ciphertext, but it's usually easiest and quickest to just test if a text makes sense when decoded using Atbash.

Sample text


The ciphertext above represents "LET THE GREAT PLOT COMMENCE" encrypted using Atbash.