diff --git a/libp2p/__init__.py b/libp2p/__init__.py
index 68b65e61..92474ad4 100644
--- a/libp2p/__init__.py
+++ b/libp2p/__init__.py
@@ -99,8 +99,11 @@ def initialize_default_swarm(
     # TODO parse muxer and sec to pass into TransportUpgrader
     muxer = muxer_opt or ["mplex/6.7.0"]
     private_key_bytes = private_key.export_key("DER")
+    public_key_bytes = private_key.publickey().export_key("DER")
     security_transports_by_protocol = sec_opt or {
-        TProtocol("insecure/1.0.0"): InsecureTransport(private_key_bytes)
+        TProtocol("insecure/1.0.0"): InsecureTransport(
+            private_key_bytes, public_key_bytes
+        )
     }
     upgrader = TransportUpgrader(security_transports_by_protocol, muxer)
 
diff --git a/libp2p/security/base_transport.py b/libp2p/security/base_transport.py
index 65c9757a..135454e1 100644
--- a/libp2p/security/base_transport.py
+++ b/libp2p/security/base_transport.py
@@ -8,6 +8,6 @@ class BaseSecureTransport(ISecureTransport):
     is only meant to be used in clases that derive from it.
     """
 
-    def __init__(self, local_private_key: bytes) -> None:
+    def __init__(self, local_private_key: bytes, local_public_key: bytes) -> None:
         self.local_private_key = local_private_key
-        self.local_peer = ID.from_privkey(local_private_key)
+        self.local_peer = ID.from_pubkey(local_public_key)
diff --git a/libp2p/security/simple/transport.py b/libp2p/security/simple/transport.py
index 8a9c6dbb..ac9c01e4 100644
--- a/libp2p/security/simple/transport.py
+++ b/libp2p/security/simple/transport.py
@@ -10,7 +10,10 @@ from libp2p.security.secure_conn_interface import ISecureConn
 class SimpleSecurityTransport(BaseSecureTransport):
     key_phrase: str
 
-    def __init__(self, key_phrase: str) -> None:
+    def __init__(
+        self, local_private_key: bytes, local_public_key: bytes, key_phrase: str
+    ) -> None:
+        super().__init__(local_private_key, local_public_key)
         self.key_phrase = key_phrase
 
     async def secure_inbound(self, conn: IRawConnection) -> ISecureConn: