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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.
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 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.
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.
Cryptography Worksheet — The Affine Cipher 1 The Affine Cipher is a cipher that uses Maths to encode the message. It works by conver ng every le ©er in the alphabet into a number, performing a func on on that number, and turning the result back into a le ©er.
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'
The Affine cipher is a monoalphabetic substitution cipher, where each letter in the alphabet is mapped to another letter through a simple mathematical formula: (ax + b) mod 26. The number 26 represents the length of the alphabet and will be different for different languages.
