caesar cipher python

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showing results for - "caesar cipher python"
Ida
28 Apr 2016
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
source
Juan
30 Nov 2020
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
Aldo
04 Jan 2017
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)
Elysia
14 Feb 2020
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)}')
Leah
27 May 2017
1def encrypt(text,s):
2result = ""
3   # transverse the plain text
4   for i in range(len(text)):
5      char = text[i]
6      # Encrypt uppercase characters in plain text
7      
8      if (char.isupper()):
9         result += chr((ord(char) + s-65) % 26 + 65)
10      # Encrypt lowercase characters in plain text
11      else:
12         result += chr((ord(char) + s - 97) % 26 + 97)
13      return result
14#check the above function
15text = "CEASER CIPHER DEMO"
16s = 4
17
18print "Plain Text : " + text
19print "Shift pattern : " + str(s)
20print "Cipher: " + encrypt(text,s)
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