What is Affine Cipher?

as Wikipedia says: The affine cipher is a type of monoalphabetic substitution cipher, where each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple mathematical function, and converted back to a letter.

• look at the entire article from here: https://en.wikipedia.org/wiki/Affine_cipher

  Formula

  C = (a * P + b) mod 26
  P = (a ^ -1 * (C - b)) mod 26

Guide

 ! Usage: python3 affinecipher.py <type> <string> <a> <b>
* type    : {e: encryption, d: decryption}
* string  : the text you want to encrypt or decrypt
* a       : the first operand of the key
* b       : the second operand of the key

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