diff --git a/crypto/lux_key.go b/crypto/lux_key.go
index 04df4cf..c155f0b 100644
--- a/crypto/lux_key.go
+++ b/crypto/lux_key.go
@@ -6,11 +6,14 @@ import (
 )
 
 type LuxKey struct {
-	Type proto.LuxType
-	Id   proto.LuxID
-	Key  []byte
+	Type proto.LuxType // 2
+	Id   proto.LuxID   // 16
+	Key  []byte        // 32
 }
 
+const LUX_KEY_AES_SIZE = 32
+const LUX_PROTO_KEY_SIZE = proto.LUX_PROTO_TYPE_SIZE + proto.LUX_PROTO_ID_SIZE + LUX_KEY_AES_SIZE
+
 func (key *LuxKey) NewLuxKey(keyType proto.LuxType) error {
 	key.Type = keyType
 	key.Id = proto.NewLuxID()
diff --git a/proto/lux_id.go b/proto/lux_id.go
index 39c3765..2f84f13 100644
--- a/proto/lux_id.go
+++ b/proto/lux_id.go
@@ -4,6 +4,8 @@ import "github.com/google/uuid"
 
 type LuxID struct{ uuid.UUID }
 
+const LUX_PROTO_ID_SIZE = 16
+
 func NewLuxID() LuxID {
 	return LuxID{uuid.New()}
 }
diff --git a/proto/lux_type.go b/proto/lux_type.go
index a619f34..9707544 100644
--- a/proto/lux_type.go
+++ b/proto/lux_type.go
@@ -7,6 +7,8 @@ const (
 	LuxTypeNode
 )
 
+const LUX_PROTO_TYPE_SIZE = 2
+
 func (luxType *LuxType) Read(rd *LuxBuffer) error {
 	if val, err := rd.ReadUint16(); err != nil {
 		return err