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import sys

def encrypt(strng, key):

encrypted = ''

for x in strng:

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

if indx > 126:

indx = indx - 95

encrypted = encrypted + chr(indx)

return encrypted

def decrypt(strng, key):

decrypted = ''

for x in strng:

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

if indx < 32:

indx = indx + 95

decrypted = decrypted + chr(indx)

return decrypted

def brute_force(strng):

key = 1

decrypted = ''

while key <= 94:

for x in strng:

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

if indx < 32:

indx = indx + 95

decrypted = decrypted + chr(indx)

print("Key: {}\t| Message: {}".format(key, decrypted))

decrypted = ''

key += 1

return None

def main():

while True:

print('-' * 10 + "\n**Menu**\n" + '-' * 10)

print("1.Encrpyt")

print("2.Decrypt")

print("3.BruteForce")

print("4.Quit")

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

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

print ("Invalid choice")

elif choice == '1':

strng = input("Please enter the string to be ecrypted: ")

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

if key in range(1, 95):

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

elif choice == '2':

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

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

if key > 0 and key <= 94:

print(decrypt(strng, key))

elif choice == '3':

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

brute_force(strng)

main()

elif choice == '4':

print ("Goodbye.")

break

main()