diff --git a/zen/tools/crypto.proto b/zen/tools/crypto.proto
new file mode 100644
index 0000000..182b0d4
--- /dev/null
+++ b/zen/tools/crypto.proto
@@ -0,0 +1,22 @@
+syntax = "proto2";
+
+package crypto.pb;
+
+option go_package = "github.com/libp2p/go-libp2p-core/crypto/pb";
+
+enum KeyType {
+	RSA = 0;
+	Ed25519 = 1;
+	Secp256k1 = 2;
+	ECDSA = 3;
+}
+
+message PublicKey {
+	required KeyType Type = 1;
+	required bytes Data = 2;
+}
+
+message PrivateKey {
+	required KeyType Type = 1;
+	required bytes Data = 2;
+}
diff --git a/zen/tools/crypto_pb2.py.old b/zen/tools/crypto_pb2.py.old
new file mode 100644
index 0000000..d6b953a
--- /dev/null
+++ b/zen/tools/crypto_pb2.py.old
@@ -0,0 +1,162 @@
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: crypto.proto
+
+import sys
+_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
+from google.protobuf.internal import enum_type_wrapper
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor.FileDescriptor(
+  name='crypto.proto',
+  package='crypto.pb',
+  syntax='proto2',
+  serialized_options=_b('Z*github.com/libp2p/go-libp2p-core/crypto/pb'),
+  serialized_pb=_b('\n\x0c\x63rypto.proto\x12\tcrypto.pb\";\n\tPublicKey\x12 \n\x04Type\x18\x01 \x02(\x0e\x32\x12.crypto.pb.KeyType\x12\x0c\n\x04\x44\x61ta\x18\x02 \x02(\x0c\"<\n\nPrivateKey\x12 \n\x04Type\x18\x01 \x02(\x0e\x32\x12.crypto.pb.KeyType\x12\x0c\n\x04\x44\x61ta\x18\x02 \x02(\x0c*9\n\x07KeyType\x12\x07\n\x03RSA\x10\x00\x12\x0b\n\x07\x45\x64\x32\x35\x35\x31\x39\x10\x01\x12\r\n\tSecp256k1\x10\x02\x12\t\n\x05\x45\x43\x44SA\x10\x03\x42,Z*github.com/libp2p/go-libp2p-core/crypto/pb')
+)
+
+_KEYTYPE = _descriptor.EnumDescriptor(
+  name='KeyType',
+  full_name='crypto.pb.KeyType',
+  filename=None,
+  file=DESCRIPTOR,
+  values=[
+    _descriptor.EnumValueDescriptor(
+      name='RSA', index=0, number=0,
+      serialized_options=None,
+      type=None),
+    _descriptor.EnumValueDescriptor(
+      name='Ed25519', index=1, number=1,
+      serialized_options=None,
+      type=None),
+    _descriptor.EnumValueDescriptor(
+      name='Secp256k1', index=2, number=2,
+      serialized_options=None,
+      type=None),
+    _descriptor.EnumValueDescriptor(
+      name='ECDSA', index=3, number=3,
+      serialized_options=None,
+      type=None),
+  ],
+  containing_type=None,
+  serialized_options=None,
+  serialized_start=150,
+  serialized_end=207,
+)
+_sym_db.RegisterEnumDescriptor(_KEYTYPE)
+
+KeyType = enum_type_wrapper.EnumTypeWrapper(_KEYTYPE)
+RSA = 0
+Ed25519 = 1
+Secp256k1 = 2
+ECDSA = 3
+
+
+
+_PUBLICKEY = _descriptor.Descriptor(
+  name='PublicKey',
+  full_name='crypto.pb.PublicKey',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='Type', full_name='crypto.pb.PublicKey.Type', index=0,
+      number=1, type=14, cpp_type=8, label=2,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='Data', full_name='crypto.pb.PublicKey.Data', index=1,
+      number=2, type=12, cpp_type=9, label=2,
+      has_default_value=False, default_value=_b(""),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+  ],
+  extensions=[
+  ],
+  nested_types=[],
+  enum_types=[
+  ],
+  serialized_options=None,
+  is_extendable=False,
+  syntax='proto2',
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=27,
+  serialized_end=86,
+)
+
+
+_PRIVATEKEY = _descriptor.Descriptor(
+  name='PrivateKey',
+  full_name='crypto.pb.PrivateKey',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='Type', full_name='crypto.pb.PrivateKey.Type', index=0,
+      number=1, type=14, cpp_type=8, label=2,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='Data', full_name='crypto.pb.PrivateKey.Data', index=1,
+      number=2, type=12, cpp_type=9, label=2,
+      has_default_value=False, default_value=_b(""),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+  ],
+  extensions=[
+  ],
+  nested_types=[],
+  enum_types=[
+  ],
+  serialized_options=None,
+  is_extendable=False,
+  syntax='proto2',
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=88,
+  serialized_end=148,
+)
+
+_PUBLICKEY.fields_by_name['Type'].enum_type = _KEYTYPE
+_PRIVATEKEY.fields_by_name['Type'].enum_type = _KEYTYPE
+DESCRIPTOR.message_types_by_name['PublicKey'] = _PUBLICKEY
+DESCRIPTOR.message_types_by_name['PrivateKey'] = _PRIVATEKEY
+DESCRIPTOR.enum_types_by_name['KeyType'] = _KEYTYPE
+_sym_db.RegisterFileDescriptor(DESCRIPTOR)
+
+PublicKey = _reflection.GeneratedProtocolMessageType('PublicKey', (_message.Message,), dict(
+  DESCRIPTOR = _PUBLICKEY,
+  __module__ = 'crypto_pb2'
+  # @@protoc_insertion_point(class_scope:crypto.pb.PublicKey)
+  ))
+_sym_db.RegisterMessage(PublicKey)
+
+PrivateKey = _reflection.GeneratedProtocolMessageType('PrivateKey', (_message.Message,), dict(
+  DESCRIPTOR = _PRIVATEKEY,
+  __module__ = 'crypto_pb2'
+  # @@protoc_insertion_point(class_scope:crypto.pb.PrivateKey)
+  ))
+_sym_db.RegisterMessage(PrivateKey)
+
+
+DESCRIPTOR._options = None
+# @@protoc_insertion_point(module_scope)