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caesar_cipher.py

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def encrypt(input_string: str, key: int) -> str:

result = ""

for x in input_string:

if not x.isalpha():

result += x

elif x.isupper():

result += chr((ord(x) + key - 65) % 26 + 65)

elif x.islower():

result += chr((ord(x) + key - 97) % 26 + 97)

return result

def decrypt(input_string: str, key: int) -> str:

result = ""

for x in input_string:

if not x.isalpha():

result += x

elif x.isupper():

result += chr((ord(x) - key - 65) % 26 + 65)

elif x.islower():

result += chr((ord(x) - key - 97) % 26 + 97)

return result

def brute_force(input_string: str) -> None:

key = 1

result = ""

while key <= 94:

for x in input_string:

indx = (ord(x) - key) % 256

if indx < 32:

indx = indx + 95

result = result + chr(indx)

print(f"Key: {key}\t| Message: {result}")

result = ""

key += 1

return None

def main():

while True:

print(f'{"-" * 10}\n Menu\n{"-" * 10}')

print(*["1.Encrpyt", "2.Decrypt", "3.BruteForce", "4.Quit"], sep="\n")

choice = input("What would you like to do?: ")

if choice not in ["1", "2", "3", "4"]:

print("Invalid choice, please enter a valid choice")

elif choice == "1":

input_string = input("Please enter the string to be encrypted: ")

key = int(input("Please enter off-set between 0-25: "))

if key in range(1, 95):

print(encrypt(input_string.lower(), key))

elif choice == "2":

input_string = input("Please enter the string to be decrypted: ")

key = int(input("Please enter off-set between 1-94: "))

if key in range(1, 95):

print(decrypt(input_string, key))

elif choice == "3":

input_string = input("Please enter the string to be decrypted: ")

brute_force(input_string)

main()

elif choice == "4":

print("Goodbye.")

break

if __name__ == "__main__":

main()