diff --git a/librespot/audio/AudioKeyManager.py b/librespot/audio/AudioKeyManager.py
index 2f10285..6342713 100644
--- a/librespot/audio/AudioKeyManager.py
+++ b/librespot/audio/AudioKeyManager.py
@@ -3,7 +3,7 @@ from librespot.common import Utils
 from librespot.core import Session
 from librespot.core.PacketsReceiver import PacketsReceiver
 from librespot.crypto import Packet
-from librespot.standard import BytesInputStream, BytesOutputStream
+from librespot.standard import BytesInputStream, ByteArrayOutputStream
 import logging
 import queue
 import threading
@@ -30,13 +30,13 @@ class AudioKeyManager(PacketsReceiver):
             seq = self._seqHolder
             self._seqHolder += 1
 
-        out = BytesOutputStream()
-        out.write(file_id)
-        out.write(gid)
-        out.write_int(seq)
-        out.write(self._ZERO_SHORT)
+        out = ByteArrayOutputStream()
+        out.write(buffer=bytearray(file_id))
+        out.write(buffer=bytearray(gid))
+        out.write(buffer=bytearray(Utils.to_byte_array(seq)))
+        out.write(buffer=bytearray(self._ZERO_SHORT))
 
-        self._session.send(Packet.Type.request_key, out.buffer)
+        self._session.send(Packet.Type.request_key, out.to_bytes())
 
         callback = AudioKeyManager.SyncCallback(self)
         self._callbacks[seq] = callback
diff --git a/librespot/core/Session.py b/librespot/core/Session.py
index 10c9bf3..5285b05 100644
--- a/librespot/core/Session.py
+++ b/librespot/core/Session.py
@@ -233,8 +233,8 @@ class Session(Closeable, SubListener, DealerClient.MessageListener):
 
         self._LOGGER.info("Connection successfully!")
 
-    def authenticate(self,
-                     credentials: Authentication.LoginCredentials) -> None:
+    def _authenticate(self,
+                      credentials: Authentication.LoginCredentials) -> None:
         self._authenticate_partial(credentials, False)
 
         with self._authLock:
@@ -707,7 +707,7 @@ class Session(Closeable, SubListener, DealerClient.MessageListener):
                               self.device_id),
                 ApResolver.get_random_accesspoint())
             session._connect()
-            session.authenticate(self.login_credentials)
+            session._authenticate(self.login_credentials)
             return session
 
     class Configuration: