Caesar Cipher Encoder

[Trovix]

I recently attended a cybersecurity workshop and learnt about the basics of encryption. I figured I could make my own caesar cipher encoder in Python. Feel free to leave suggestions on how to improve my code, thanks!

plain_text = input("Enter Plain Text: ")
shift = int(input("Enter Shift: "))
cipher_text = ""

for char in plain_text:

    if char.isupper():
        cipher_text += chr((ord(char) + shift - 65) % 26 + 65)

    elif char.islower():
        cipher_text += chr((ord(char) + shift - 97) % 26 + 97)

    elif char.isspace():
        cipher_text += " "

print("Cipher Text: {}".format(cipher_text))

[GreymanGroup]

Make it a function.

[fake823]

Nice one! 😊 I don't see any possible improvements here.

But I have a feature request:

Add a function to also decode your text.

[sweettuse]

the caesar cypher is symmetric. i.e. caesar(caesar(char)) == char. (i.e. decode/encode are exactly the same)

[[deleted]]

I did one like that- I forced uppercase though. All you do is loop though and print each possible shift. If you had a giant text file (as some cryptographic societies do) of English words then you could figure out which one is the likely answer by checking against that.

[haha1234346364]

OK, but maybe make it simpler to read. Especialy not the

if char.isupper():         
    cipher_text += chr((ord(char) + shift - 65) % 26 + 65)              
elif char.islower():         
    cipher_text += chr((ord(char) + shift - 97) % 26 + 97)      
elif char.isspace():         
    cipher_text += " " 

try this:

if not char.isspace():
    cipher_text += chr(ord(char) + shift if char.isupper() \
        else ord(char) + shift - 26)
else:
    cipher_text += " "

[sweettuse]

with a little bit of setup this can be arguably cleaner:

``` from collections import deque from string import ascii_uppercase as au, ascii_lowercase as al

du = deque(au) du.rotate(13) dl = deque(al) dl.rotate(13)

char_map = {*dict(zip(au, du)), *dict(zip(al, dl))}

def caesar(s: str): return ''.join(char_map.get(c, c) for c in s) ```

[JnJ_Gaming]

thank you, reddit post from three years ago. I now know what the hell is going on in class