python caesar cipher

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showing results for - "python caesar cipher"
Lya
20 Jan 2018
1def caesar_encrypt():
2    word = input('Enter the plain text: ')
3    c = ''
4    for i in word:
5        if (i == ' '):
6            c += ' '
7        else:
8            c += (chr(ord(i) + 3))
9    return c
10
11def caesar_decrypt():
12    word = input('Enter the cipher text: ')
13    c = ''
14    for i in word:
15        if (i == ' '):
16            c += ' '
17        else:
18            c += (chr(ord(i) - 3))
19    return c
20  
21plain = 'hello'
22cipher = caesar_encrypt(plain)
23decipher = caesar_decrypt(cipher)
24
source
Franco
28 Feb 2019
1def ascii_caesar_shift(message, distance):
2    encrypted = ""
3    for char in message:
4        value = ord(char) + distance
5        encrypted += chr(value % 128) #128 for ASCII
6    return encrypted
Alessio
08 Apr 2019
1x = input()
2NUM_LETTERS = 26
3def SpyCoder(S, N):
4   y = ""
5   for i in S:
6      if(i.isupper()):
7         x = ord(i)
8         x += N
9         if x > ord('Z'):
10            x -= NUM_LETTERS
11         elif x < ord('A'):
12            x += NUM_LETTERS
13         y += chr(x)
14      else:
15         y += " "
16   return y
17
18def GoodnessFinder(S):
19   y = 0
20   for i in S:
21      if i.isupper():
22         x = ord(i)
23         x -= ord('A')
24         y += letterGoodness[x]
25      else:
26         y += 1
27   return y
28
29def GoodnessComparer(S):
30   goodnesstocompare = GoodnessFinder(S)
31   goodness = 0
32   v = ''
33   best_v = S
34   for i in range(0, 26):
35     v = SpyCoder(S, i)
36     goodness = GoodnessFinder(v)
37     if goodness > goodnesstocompare:
38         best_v = v
39         goodnesstocompare = goodness
40   return best_v
41
42
43print(GoodnessComparer(x))
Lois
08 Aug 2019
1plaintext = input("Please enter your plaintext: ")
2shift = input("Please enter your key: ")
3alphabet = "abcdefghijklmnopqrstuvwxyz"
4ciphertext = ""
5
6# shift value can only be an integer
7while isinstance(int(shift), int) == False:
8  # asking the user to reenter the shift value
9  shift = input("Please enter your key (integers only!): ")
10
11shift = int(shift)
12  
13new_ind = 0 # this value will be changed later
14for i in plaintext:
15  if i.lower() in alphabet:
16    new_ind = alphabet.index(i) + shift
17    ciphertext += alphabet[new_ind % 26]
18  else:
19    ciphertext += i    
20print("The ciphertext is: " + ciphertext)
Josué
05 Jul 2017
1def cc_encrypt(msg: str,key: int) -> str:
2    encrypted_msg = ''
3
4    try:
5        for char in msg:
6            encrypted_msg += str(chr(ord(char)+int(key)))
7    except:
8        print(Exception)
9        pass
10    
11    return encrypted_msg
12
13def cc_decrypt(msg: str,key: int) -> str:
14    decrypted_msg = ''
15
16    try:
17        for char in msg:
18            decrypted_msg += chr(ord(char)-int(key))
19    except:
20        print(Exception)
21        pass
22
23    return decrypted_msg
24
25  
26message = 'Hello World!'
27key = 9
28print(f'Caesar Cipher:\nEncrypted: {cc_encrypt(message,key)}\nDecrypted: {cc_decrypt(cc_encrypt(message,key),key)}')
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