diff --git a/monkey/monkey_island/cc/server_utils/encryptor.py b/monkey/monkey_island/cc/server_utils/encryptor.py
index 2a9ce8fea..dd088530f 100644
--- a/monkey/monkey_island/cc/server_utils/encryptor.py
+++ b/monkey/monkey_island/cc/server_utils/encryptor.py
@@ -25,30 +25,33 @@ class Encryptor:
 
     def _init_key(self, password_file):
         self._cipher_key = Random.new().read(self._BLOCK_SIZE)
-        with open(password_file, 'wb') as f:
+        with open(password_file, "wb") as f:
             f.write(self._cipher_key)
 
     def _load_existing_key(self, password_file):
-        with open(password_file, 'rb') as f:
+        with open(password_file, "rb") as f:
             self._cipher_key = f.read()
 
     def _pad(self, message):
         return message + (self._BLOCK_SIZE - (len(message) % self._BLOCK_SIZE)) * chr(
-            self._BLOCK_SIZE - (len(message) % self._BLOCK_SIZE))
+            self._BLOCK_SIZE - (len(message) % self._BLOCK_SIZE)
+        )
 
     def _unpad(self, message: str):
-        return message[0:-ord(message[len(message) - 1])]
+        return message[0 : -ord(message[len(message) - 1])]
 
     def enc(self, message: str):
         cipher_iv = Random.new().read(AES.block_size)
         cipher = AES.new(self._cipher_key, AES.MODE_CBC, cipher_iv)
-        return base64.b64encode(cipher_iv + cipher.encrypt(self._pad(message).encode())).decode()
+        return base64.b64encode(
+            cipher_iv + cipher.encrypt(self._pad(message).encode())
+        ).decode()
 
     def dec(self, enc_message):
         enc_message = base64.b64decode(enc_message)
-        cipher_iv = enc_message[0:AES.block_size]
+        cipher_iv = enc_message[0 : AES.block_size]
         cipher = AES.new(self._cipher_key, AES.MODE_CBC, cipher_iv)
-        return self._unpad(cipher.decrypt(enc_message[AES.block_size:]).decode())
+        return self._unpad(cipher.decrypt(enc_message[AES.block_size :]).decode())
 
 
 def initialize_encryptor(data_dir):