diff --git a/p2p/ida/ida.go b/p2p/ida/ida.go
new file mode 100644
index 000000000..788e1cbfd
--- /dev/null
+++ b/p2p/ida/ida.go
@@ -0,0 +1,11 @@
+package ida
+
+// HarmonyIDA implements IDA interface.
+type HarmonyIDA struct {
+	raptorQImp *RaptorQ
+}
+
+// TakeRaptorQ takes RaptorQ implementation.
+func (ida *HarmonyIDA) TakeRaptorQ(raptorQImp *RaptorQ) {
+	ida.raptorQImp = raptorQImp
+}
diff --git a/p2p/ida/interface.go b/p2p/ida/interface.go
new file mode 100644
index 000000000..a1b6d9e67
--- /dev/null
+++ b/p2p/ida/interface.go
@@ -0,0 +1,22 @@
+package ida
+
+import (
+	"github.com/simple-rules/harmony-benchmark/p2p"
+)
+
+// Symbol is produced from a RaptorQ implementation.
+type Symbol []byte
+
+// Message is type of general message gopssiped
+type Message []byte
+
+// RaptorQ interface.
+type RaptorQ interface {
+	Init()
+	Process(msg Message) chan Symbol
+}
+
+// IDA interface.
+type IDA interface {
+	Process(msg Message, peers []p2p.Peer, timeout int)
+}
diff --git a/proto/identity/identity.go b/proto/identity/identity.go
index c676cce3d..4128548cf 100644
--- a/proto/identity/identity.go
+++ b/proto/identity/identity.go
@@ -27,6 +27,7 @@ const (
 	Register MessageType = iota
 	Acknowledge
 	Leader
+	IDCKey
 	NodeInfo
 	Peers
 )
@@ -37,6 +38,7 @@ func (msgType MessageType) String() string {
 		"Register",
 		"Acknowledge",
 		"Leader",
+		"IDCKey",
 		"NodeInfo",
 		"Peers",
 	}