init

.gitignore

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+ctext
+key

alice.py

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+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)
+
+
+

bob.py

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+from Crypto.Cipher import AES
+from Crypto.Util.Padding import unpad
+
+# Read Key
+with open('key', 'rb') as f:
+    aes_key = f.read()
+
+cipher = AES.new(aes_key, AES.MODE_CBC)
+
+# Read message and decrypt
+
+with open('ctext', 'rb') as f:
+    ciphertext = f.read()
+
+plaintext = unpad(cipher.decrypt(ciphertext), 16)
+
+print(f'Plaintext: {plaintext}')
+

requirements.txt

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+pycryptodome==3.23.0