python caesar cipher decrypt function

def caesar_encrypt(): word = input('Enter the plain text: ') c = '' for i in word: if (i == ' '): c += ' ' else: c += (chr(ord(i) + 3)) return c def caesar_decrypt(): word = input('Enter the cipher text: ') c = '' for i in word: if (i == ' '): c += ' ' else: c += (chr(ord(i) - 3)) return c plain = 'hello' cipher = caesar_encrypt(plain) decipher = caesar_decrypt(cipher)

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

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