caesar cipher decryption python

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 automatic caesar cipher decrypt

x = input()
NUM_LETTERS = 26
def SpyCoder(S, N):
   y = ""
   for i in S:
      if(i.isupper()):
         x = ord(i)
         x += N
         if x > ord('Z'):
            x -= NUM_LETTERS
         elif x < ord('A'):
            x += NUM_LETTERS
         y += chr(x)
      else:
         y += " "
   return y

def GoodnessFinder(S):
   y = 0
   for i in S:
      if i.isupper():
         x = ord(i)
         x -= ord('A')
         y += letterGoodness[x]
      else:
         y += 1
   return y

def GoodnessComparer(S):
   goodnesstocompare = GoodnessFinder(S)
   goodness = 0
   v = ''
   best_v = S
   for i in range(0, 26):
     v = SpyCoder(S, i)
     goodness = GoodnessFinder(v)
     if goodness > goodnesstocompare:
         best_v = v
         goodnesstocompare = goodness
   return best_v


print(GoodnessComparer(x))

Posted by: Guest on May-11-2021

Source

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)

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