finished hw

part1/bob.py

@@ -0,0 +1,18 @@
+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, iv=b'0'*16)
+
+# Read message and decrypt
+
+with open('ctext', 'rb') as f:
+    ciphertext = f.read()
+
+plaintext = unpad(cipher.decrypt(ciphertext), 16).decode()
+
+print(f'Plaintext: {plaintext}')
+