python library for caesar cipher encryption and decryption

python caesar cipher

plaintext = input("Please enter your plaintext: ")
shift = input("Please enter your key: ")
alphabet = "abcdefghijklmnopqrstuvwxyz"
ciphertext = ""

# shift value can only be an integer
while isinstance(int(shift), int) == False:
  # asking the user to reenter the shift value
  shift = input("Please enter your key (integers only!): ")

shift = int(shift)
  
new_ind = 0 # this value will be changed later
for i in plaintext:
  if i.lower() in alphabet:
    new_ind = alphabet.index(i) + shift
    ciphertext += alphabet[new_ind % 26]
  else:
    ciphertext += i    
print("The ciphertext is: " + ciphertext)

Posted by: Guest on June-07-2020

def cc_encrypt(msg: str,key: int) -> str: encrypted_msg = '' try: for char in msg: encrypted_msg += str(chr(ord(char)+int(key))) except: print(Exception) pass return encrypted_msg def cc_decrypt(msg: str,key: int) -> str: decrypted_msg = '' try: for char in msg: decrypted_msg += chr(ord(char)-int(key)) except: print(Exception) pass return decrypted_msg message = 'Hello World!' key = 9 print(f'Caesar Cipher:nEncrypted: {cc_encrypt(message,key)}nDecrypted: {cc_decrypt(cc_encrypt(message,key),key)}')

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