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crypto-hw3/alice.py
T
2025-09-22 11:29:37 -05:00

31 lines
568 B
Python

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad
from Crypto.Random import get_random_bytes
# Generate new secret key
with open('key', 'wb') as f:
f.write(get_random_bytes(16))
plaintext = input("Please input the message: ")
# Pad plaintext
plaintext = plaintext.encode()
plaintext = pad(plaintext, 16)
# Read Key
with open('key', 'rb') as f:
aes_key = f.read()
# Encrypt and send (write) message
cipher = AES.new(aes_key, AES.MODE_CBC)
ciphertext = cipher.encrypt(plaintext)
with open('ctext', 'wb') as f:
f.write(ciphertext)