Tool to decrypt/encrypt with Atbash (Mirror code), a substitution cipher replacing the first letter of the alphabet with the last, the second with the penultimate etc.
Atbash Cipher - dCode
Tag(s) : Substitution Cipher
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Atbash cipher (also called mirror cipher or backwards alphabet or reverse alphabet) is the name given to a monoalphabetical substitution cipher which owes its name and origins to the Hebrew alphabet.
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:
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
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.
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 appear 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, word written in reverse (hsabta) are also clues.
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.
Atbash would have been imagined between -1000 and -500 (before Christ).