Your first assignment is implementing autokey $($one time pad$)$ functionality to Vernam Cipher.

Initial code is attached. You can use that code to implement.

You can use any programming language, but in this case you need to implement Vernam Cipher by yourself.$($i would like to use pyhton$)$

The assignment is as below;

$-$ You need to have ten passwords and ten plain texts

$-$ each plain text will be ecrypted with a different password. After encryption, the cipher text will be decrypted by the same password

$-$ After encryption or decryption, throw away used password

$-$ make sure, in the code, by testing that, you decrypted text and plain text are the same

$-$ generate the password with diffie helman

$-$ do the encrption and decrytion on two different servers, witout sharing the password $($diffie hellman$)$

Complete all the required tasks in the assignment using this code below

# Vernam Cipher

import random

#and

$"""$

AND

A B R

$000$

$010$

$100$

$111$

OR

A B R

$000$

$011$

$101$

$111$

XOR

A B R

$000$

$011$

$101$

$110$

$"""$

def generate$\_$key$($plaintext$\_$length$)$:

$$ key $=\text{'}\text{'}.$join$($random$.$choice$(\text{'}$ABCDEFGHIJKLMNOPQRSTUVWXYZ$\text{'})$ for $\_$ in range$($plaintext$\_$length$))$

$$ return key

def encrypt$($plaintext$,$ key$)$:

$$ #a $=>97$

$$ # HELLO

$$ # ASDF

$$ # zip $=>$ HELLO ASDF

$$ # c$1$ c$2$

$$ # H $$A

$$ # E $$S

$$ # $7201001000$

$$ # $7101000111$

$$ # XOR:

$$ # $00001111$

$$ ciphertext $=""$

$$ for p$,$ k in zip$($plaintext$,$ key$)$:

$$ ciphertext $+=$ str$($chr$($ord$($p$)^$ ord$($k$)))$

$$ return ciphertext

def decrypt$($ciphertext$,$ key$)$:

$$ for c$,$ k in zip$($ciphertext$,$ key$)$:

$$ decrypted$\_$text $=$ str$($chr$($ord$($c$)^$ ord$($k$)))$

$$ return decrypted$\_$text

# Example usage

if $\_\_$name$\_\_=="\_\_$main$\_\_"$:

$$ plaintext $=$ "HELLO"

$$ key $=$ generate$\_$key$($len$($plaintext$))$

$$ print$("$Plaintext:$",$ plaintext$)$

$$ print$("$Key:$",$ key$)$

$$ ciphertext $=$ encrypt$($plaintext$,$ key$)$

$$ print$("$Ciphertext:$",$ ciphertext$)$

$$ decrypted$\_$text $=$ decrypt$($ciphertext$,$ key$)$

$$ print$("$Decrypted Text:", decrypted$\_$text$)$