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ATBASH

A simple linear cipher originally used on the Hebrew alphabet.

How it works

Encoding

The ATBASH cipher is pretty simple, and all its does is reverse the letters in the alphabet: A becomes Z, B becomes Y, ..., Y becomes B, Z becomes A.

Here's the full table:

A B C D E F G H I J K L M
Z Y X W V U T S R Q P O N

Encoding the word crypto, we get:

C R Y P T O
X I B K G L

Decoding

We can observe that applying the code twice to a message letter, will leave us with the original message. To decrypt, we just have to re-apply the code.

X I B K G L
C R Y P T O

Cons

  • Pretty simple and famous cipher.
  • Frequency analysis can be used to crack the code, if the message is long enough.

Implementations


Source: CrypTools Cipher Repository