finished hw

part2/alice.py

@@ -0,0 +1,20 @@
+from Crypto.PublicKey import RSA
+from Crypto.Cipher import PKCS1_OAEP
+
+# Read Bob's public key
+with open("bob_public.pem", "rb") as f:
+    public_key = RSA.import_key(f.read())
+
+# Get the message from the command line
+message = input("Enter a message: ").encode()
+
+# Create a cipher object using Bob's public key
+cipher = PKCS1_OAEP.new(public_key)
+
+# Encrypt the message
+ciphertext = cipher.encrypt(message)
+
+# Write the ciphertext
+with open("ctext", "wb") as f:
+    f.write(ciphertext)
+