diff --git a/pulsar/__init__.py b/pulsar/__init__.py
index d3b081d..92cf10f 100644
--- a/pulsar/__init__.py
+++ b/pulsar/__init__.py
@@ -440,6 +440,26 @@ def policy(self):
         """
         return self._policy
 
+class CryptoKeyReader:
+    """
+    Default crypto key reader implementation
+    """
+    def __init__(self, public_key_path, private_key_path):
+        """
+        Create crypto key reader.
+
+        Parameters
+        ----------
+
+        public_key_path: str
+            Path to the public key
+        private_key_path: str
+            Path to private key
+        """
+        _check_type(str, public_key_path, 'public_key_path')
+        _check_type(str, private_key_path, 'private_key_path')
+        self.cryptoKeyReader = _pulsar.CryptoKeyReader(public_key_path, private_key_path)
+
 class Client:
     """
     The Pulsar client. A single client instance can be used to create producers
@@ -574,7 +594,7 @@ def create_producer(self, topic,
                         schema=schema.BytesSchema(),
                         initial_sequence_id=None,
                         send_timeout_millis=30000,
-                        compression_type=CompressionType.NONE,
+                        compression_type: CompressionType = CompressionType.NONE,
                         max_pending_messages=1000,
                         max_pending_messages_across_partitions=50000,
                         block_if_queue_full=False,
@@ -583,13 +603,13 @@ def create_producer(self, topic,
                         batching_max_allowed_size_in_bytes=128*1024,
                         batching_max_publish_delay_ms=10,
                         chunking_enabled=False,
-                        message_routing_mode=PartitionsRoutingMode.RoundRobinDistribution,
+                        message_routing_mode: PartitionsRoutingMode = PartitionsRoutingMode.RoundRobinDistribution,
                         lazy_start_partitioned_producers=False,
                         properties=None,
-                        batching_type=BatchingType.Default,
+                        batching_type: BatchingType = BatchingType.Default,
                         encryption_key=None,
-                        crypto_key_reader=None,
-                        access_mode=ProducerAccessMode.Shared,
+                        crypto_key_reader: CryptoKeyReader = None,
+                        access_mode: ProducerAccessMode = ProducerAccessMode.Shared,
                         ):
         """
         Create a new producer on a given topic.
@@ -752,7 +772,7 @@ def create_producer(self, topic,
         return p
 
     def subscribe(self, topic, subscription_name,
-                  consumer_type=ConsumerType.Exclusive,
+                  consumer_type: ConsumerType = ConsumerType.Exclusive,
                   schema=schema.BytesSchema(),
                   message_listener=None,
                   receiver_queue_size=1000,
@@ -764,8 +784,8 @@ def subscribe(self, topic, subscription_name,
                   is_read_compacted=False,
                   properties=None,
                   pattern_auto_discovery_period=60,
-                  initial_position=InitialPosition.Latest,
-                  crypto_key_reader=None,
+                  initial_position: InitialPosition = InitialPosition.Latest,
+                  crypto_key_reader: CryptoKeyReader = None,
                   replicate_subscription_state_enabled=False,
                   max_pending_chunked_message=10,
                   auto_ack_oldest_chunked_message_on_queue_full=False,
@@ -773,7 +793,7 @@ def subscribe(self, topic, subscription_name,
                   batch_receive_policy=None,
                   key_shared_policy=None,
                   batch_index_ack_enabled=False,
-                  regex_subscription_mode=RegexSubscriptionMode.PersistentOnly,
+                  regex_subscription_mode: RegexSubscriptionMode = RegexSubscriptionMode.PersistentOnly,
                   dead_letter_policy: ConsumerDeadLetterPolicy = None,
                   ):
         """
@@ -966,7 +986,7 @@ def create_reader(self, topic, start_message_id,
                       reader_name=None,
                       subscription_role_prefix=None,
                       is_read_compacted=False,
-                      crypto_key_reader=None,
+                      crypto_key_reader: CryptoKeyReader = None,
                       start_message_id_inclusive=False
                       ):
         """
@@ -1713,27 +1733,6 @@ def is_connected(self):
         return self._reader.is_connected()
 
 
-class CryptoKeyReader:
-    """
-    Default crypto key reader implementation
-    """
-    def __init__(self, public_key_path, private_key_path):
-        """
-        Create crypto key reader.
-
-        Parameters
-        ----------
-
-        public_key_path: str
-            Path to the public key
-        private_key_path: str
-            Path to private key
-        """
-        _check_type(str, public_key_path, 'public_key_path')
-        _check_type(str, private_key_path, 'private_key_path')
-        self.cryptoKeyReader = _pulsar.CryptoKeyReader(public_key_path, private_key_path)
-
-
 class ConsoleLogger:
     """
     Logger that writes on standard output