Affine Cipher

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Dublin Core

Title

Affine Cipher

Subject

Affine Cipher

Description

The Affine Cipher is a form of substitution cipher that involves math. The shift of the alphabet- while transpositioning plaintext into ciphertext is determined by a mathematical equation. This equation is:

E(x) = (ax+b) mod m

E(x) = The number equaling the letter to be used in the cipher text
a, b = Any given number
x = the number correlating to the plaintext letter
mod m = A mathematical way (subtraction, division, etc.) to bring (ax+b) back within range of 26 for all answers.

To decrypt, the equation is c(x-b) mod m.
c = the modular multiplicative inverse of a

Creator

Unknown

Source

https://crypto.interactive-maths.com/affine-cipher.html

Publisher

Crypto Corner

Contributor

Daniel Rodriguez-Clark

Format

.JPEG

Language

English

Still Image Item Type Metadata

Original Format

Cipher

Citation

Unknown, “Affine Cipher,” Ciphers and Encryption, accessed September 26, 2021, https://crypto.omeka.net/items/show/23.