Question

A Caesar cipher encrypts a message by shifting letters in the alphabet. For example, a

shift of 4 maps 'a' to 'e' and maps 'p' to 't' Here is a famous line from Shakespeare

encrypted with a shift of 4: 'vq dg qt pqv vq dg: vjcv ku vjg swguvkqp.'

(a) Write a program that takes as input a string to be encrypted and an integer encrpytion

shift (such as 4 mentioned earlier), and prints the encrypted string. [Hint: zip()

is helpful in building a dictionary. Also, remember to handle space–it doesn’t shift].

(b) Extend your program to take an additional input that indicates if your program is

to encrypt or decrypt the string.

Please write a python program

Answer 1

PLEASE GIVE IT A THUMBS UP, I SERIOUSLY NEED ONE, IF YOU NEED ANY MODIFICATION THEN LET ME KNOW, I WILL DO IT FOR YOU

import string


def cesar_cipher(msg, n, decrypt=False):
    if decrypt:
        n = -n
    shifted = string.ascii_lowercase[n:] + string.ascii_lowercase[:n]
    char_map = dict(zip(string.ascii_lowercase, shifted))
    return ''.join((char_map[c] if c in char_map else c) for c in msg.lower())


if __name__ == '__main__':
    msg = 'To be or not to be: that is the question.'
    e = cesar_cipher(msg, 2)
    d = cesar_cipher(e, 2, True)
    print(e)
    print(d)