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7 Μαρ 2023 · The Affine cipher is a type of monoalphabetic substitution cipher, wherein each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple mathematical function, and converted back to a letter. The formula used means that each letter encrypts to one other letter, and back again, meaning the cipher is essentially a ...
We use the decryption function to decrypt the ciphertext to plaintext. The decryption function will be of the form a -1 (x-b)mod m, where a -1 is the modular multiplicative inverse of a mod m i.e; a*a -1 = 1 mod m.
You can use the following code to implement an affine cipher −. class Affine(object): DIE = 128 KEY = (7, 3, 55) def __init__(self): pass def encryptChar(self, char): K1, K2, kI = self.KEY return chr((K1 * ord(char) + K2) % self.DIE) def encrypt(self, string): return "".join(map(self.encryptChar, string)) def decryptChar(self, char): K1, K2 ...
The Affine Cipher is a historical encryption technique that involves using a combination of modular arithmetic and linear algebra to encrypt messages. In this guide, we will cover the history of the Affine Cipher, how it works, implementation in Python, and more.
The affine cipher can be used to encrypt short messages with more security than the Caesar cipher provided, since its number of possible keys is based on the symbol set. But we did learn some new mathematical concepts that we will use later on.
Encryption Function Implementing Affine Cipher in Python. Decryption Function Implementing Affine Cipher in Python. Input & Output — Function calling. LIMITATIONS: Affine cipher has a small...
The decrypt method takes a ciphertext string as input, and returns the corresponding plaintext. It iterates through each character in the ciphertext, and applies the inverse Affine transformation to each character.
