diff --git a/libp2p/crypto/utils.py b/libp2p/crypto/utils.py
deleted file mode 100644
index 8519598..0000000
--- a/libp2p/crypto/utils.py
+++ /dev/null
@@ -1,17 +0,0 @@
-from .keys import PublicKey
-from .pb import crypto_pb2 as protobuf
-from .rsa import RSAPublicKey
-from .secp256k1 import Secp256k1PublicKey
-
-
-def pubkey_from_protobuf(pubkey_pb: protobuf.PublicKey) -> PublicKey:
-    if pubkey_pb.key_type == protobuf.RSA:
-        return RSAPublicKey.from_bytes(pubkey_pb.data)
-    # TODO: Test against secp256k1 keys
-    elif pubkey_pb.key_type == protobuf.Secp256k1:
-        return Secp256k1PublicKey.from_bytes(pubkey_pb.data)
-    # TODO: Support `Ed25519` and `ECDSA` in the future?
-    else:
-        raise ValueError(
-            f"unsupported key_type={pubkey_pb.key_type}, data={pubkey_pb.data!r}"
-        )
diff --git a/libp2p/security/insecure/transport.py b/libp2p/security/insecure/transport.py
index 7df0575..81e7047 100644
--- a/libp2p/security/insecure/transport.py
+++ b/libp2p/security/insecure/transport.py
@@ -2,7 +2,7 @@ from typing import Optional
 
 from libp2p.crypto.keys import PrivateKey, PublicKey
 from libp2p.crypto.pb import crypto_pb2
-from libp2p.crypto.utils import pubkey_from_protobuf
+from libp2p.crypto.serialization import deserialize_public_key
 from libp2p.io.abc import ReadWriteCloser
 from libp2p.network.connection.exceptions import RawConnError
 from libp2p.network.connection.raw_connection_interface import IRawConnection
@@ -75,7 +75,9 @@ class InsecureSession(BaseSession):
 
         # Verify if the given `pubkey` matches the given `peer_id`
         try:
-            received_pubkey = pubkey_from_protobuf(remote_msg.pubkey)
+            received_pubkey = deserialize_public_key(
+                remote_msg.pubkey.SerializeToString()
+            )
         except ValueError:
             raise HandshakeFailure(
                 f"unknown `key_type` of remote_msg.pubkey={remote_msg.pubkey}"