caesar cipher in 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)
3.8
10
def encrypt(text,s):
result = ""
# transverse the plain text
for i in range(len(text)):
char = text[i]
# Encrypt uppercase characters in plain text
if (char.isupper()):
result += chr((ord(char) + s-65) % 26 + 65)
# Encrypt lowercase characters in plain text
else:
result += chr((ord(char) + s - 97) % 26 + 97)
return result
#check the above function
text = "CEASER CIPHER DEMO"
s = 4
print "Plain Text : " + text
print "Shift pattern : " + str(s)
print "Cipher: " + encrypt(text,s)
Thank you!
10
3.8
(10 Votes)
0
4
8
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)
Thank you!
8
4
(8 Votes)
0
0
4
def ascii_caesar_shift(message, distance):
encrypted = ""
for char in message:
value = ord(char) + distance
encrypted += chr(value % 128) #128 for ASCII
return encrypted
Thank you!
4
0
0
3.9
10
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)}')
Thank you!
10
3.9
(10 Votes)
0
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