While a lot of people look at ancient Egypt for the origins of codes (and that is where the first evidence of encryption was found) Atbash was actually the first cipher. Find the letter in your cipher text on the bottom row and look above it to see it decrypted. All you need to do is create a translation table with the letters of the alphabet written from A to Z across the top and reversed along the bottom. If you find a cipher text with a lot of Vs, there’s a good chance you are looking at Atbash. When these have been encrypted using Atbash, they become V, G and Z. The most commonly used letters in English are E, T and A. Text that has been encrypted with Atbash is most easily identified using frequency analysis. With Atbash, the Affine formula is a = b = ( m − 1), where m is the length of the alphabet. Affine is encrypted by converting letters to their numerical equivalent (A=1, Z=26 etc.), putting that number through a mathematical formula, and the converting the result into letters. To use Atbash, you simply reverse the alphabet, so A encodes to Z, B to Y and so on.Ītbash is considered a special case of Affine Cipher, a monoalphabetic substitution cipher. It is believed to be the first cipher ever used, and its use pre-dates Egyptian examples of encryption. The Atbash Cipher is a really simple substitution cipher that is sometimes called mirror code.
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