diff --git a/pubnub/crypto.py b/pubnub/crypto.py
index 9942573f..a4ea6a47 100644
--- a/pubnub/crypto.py
+++ b/pubnub/crypto.py
@@ -2,7 +2,7 @@
 import json
 import random
 import logging
-
+import os
 
 from base64 import decodebytes, encodebytes, b64decode, b64encode
 from Cryptodome.Cipher import AES
@@ -69,7 +69,7 @@ def extract_random_iv(self, message, use_random_iv):
 
     def get_initialization_vector(self, use_random_iv):
         if self.pubnub_configuration.use_random_initialization_vector or use_random_iv:
-            return "{0:016}".format(random.randint(0, 9999999999999999))
+            return os.urandom(16)
         else:
             return Initial16bytes