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7 Μαρ 2023 · Implementation of Affine Cipher. 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 formula for encrypting a letter x x using the affine cipher is: y = (ax + b) y = (a x + b) mod 26 26. And apparently the decryption formula is. x = a−1(y − b) x = a − 1 (y − b) mod 26 26. Where a−1 a − 1 is the multiplicative inverse of a a mod 26 26.
Affine decryption requires to know the two keys A and B (the one from encryption) and the used alphabet. Example: Decrypt the ciphered message SNVSX with keys A=5 and B=3. For each letter of the alphabet, associate the value of its position in the alphabet.
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. The formula used means that each letter encrypts to one other letter, and back again, meaning the cipher is essentially a ...
For the first two questions, use the given alphabet to encrypt the message using the Affine Cipher. For the second two questions, use the alphabet to decrypt the ciphertext.
Affine cipher: Encode and decode. In affine cipher each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple mathematical function, and converted back to a letter. Each letter is enciphered with the function (ax + b) mod 26. Variant Beaufort cipher.
To encipher messages with the Affine cipher (or another cipher, see here for documentation): >>>from pycipher import Affine >>>Affine(a=5,b=9).encipher('defend the east wall of the castle') 'YDIDWYASDDJVAPJMMBIASDTJVAMD' >>>Affine(a=5,b=9).decipher('YDIDWYASDDJVAPJMMBIASDTJVAMD') 'DEFENDTHEEASTWALLOFTHECASTLE'
