Write a Python script that will encrypt and decrypt a plaintext message using the Caesar

cipher.

$2.$ The following ciphertext

splsoeib

Is a permutation of a plaintext word.

a$.$ Try to guess the word

b$.$ Write a Python program that will determine the original plaintext from the ciphertext.

The following code can be used to start the exhaustive search process:

import itertools

from nltk$.$corpus import words

# Ensure you have the 'words' corpus from nltk

import nltk

nltk$.$download$(\text{'}$words$\text{'})$

permuted$\_$text $=$ 'splsoeib' #the ciphertext

# Load the list of valid English words from nltk corpus

english$\_$words $=$ set$($words$.$words$())$

# Generate all possible permutations of the length of the permuted$\_$text

all$\_$permutations $=$ itertools.permutations$($range$($len$($permuted$\_$text$)))$

c$.$ What happens to your program if the ciphertext is of length $20$ characters? Explain your

observation.