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Atbash Mirror Cipher

Tool to decrypt/encrypt with Atbash automatically. Atbash (Mirror code) is a substitution cipher from the hebraic alphabet. It consists in substitution the first letter of the alphabet with the last one, the second letter, with the second last one, and so on.

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Tag(s) : Substitution Cipher

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# Atbash Mirror Cipher

## Atbash Encoder

Tool to decrypt/encrypt with Atbash automatically. Atbash (Mirror code) is a substitution cipher from the hebraic alphabet. It consists in substitution the first letter of the alphabet with the last one, the second letter, with the second last one, and so on.

### How to encrypt using Atbash cipher

Atbash encryption uses a substitution alphabet and its reciprocal, a combination of the normal alphabet and its reverse alphabet (mirrored).

Example: The latin alphabet ABCDEFGHIJKLMNOPQRSTUVWXYZ and its reverse: ZYXWVUTSRQPONMLKJIHGFEDCBA are combine in the substitution table:

 Normal ABCDEFGHIJKLMNOPQRSTUVWXYZ Reverse ZYXWVUTSRQPONMLKJIHGFEDCBA

Encryption consists in replacing letters from the first with letters from the other one, with is equivalent to replace the first letter of the alphabet A with the last one Z, the second one B with the penultimate Y etc.

Example: MIRROR becomes NRIILI

### How to decrypt Atbash cipher

Decryption is identical to encryption because of the reversible alphabet (due to the symmetry of the backwards alphabet)

Example: ZGYZHS is decrypted ATBASH

dCode offers an encoder and a decoder, but they are actually one and the same Atbash converter.

### How to recognize an Atbash ciphertext?

An Atbash ciphertext has a coincidence index similar to an unencrypted text.

If the encryption used the classical latin alphabet, letters V,G,R,L,M appears the most frequently.

Otherwise the presence of Hebrew characters or a reference to the Dead Sea can be a clue.

The notions of mirror, reflection, axis, direction or sense are also clues.

### Why is this cipher called 'Atbash'?

In the Hebraic alphabet, aleph (first letter) was replaced by tav (last letter) and beth (second letter) with shin (second last), etc. Initials make A,T,B,SH.

### What are Atbash variants?

Atbash is adaptable to any alphabet, so using the Hebrew alphabet is possible.

The atbash encryption is equivalent to an affine cipher with $a = -1$ and $b = -1$

### When Atbash have been invented?

Between -1000 and -500 before Christ.

## Source code

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