diff --git a/attack/attack.go b/attack/attack.go
index 45e2ead55..2c0e13dd4 100644
--- a/attack/attack.go
+++ b/attack/attack.go
@@ -22,7 +22,7 @@ type AttackType byte
 const (
 	KilledItself AttackType = iota
 	DelayResponse
-	IncorrectTransaction
+	IncorrectResponse
 )
 
 // AttackModel contains different models of attacking.
@@ -75,7 +75,7 @@ func (attack *Attack) NodeKilledByItSelf() {
 	}
 
 	if rand.Intn(HitRate) == 0 {
-		attack.log.Debug("******Killing myself*******", "PID: ", os.Getpid())
+		attack.log.Debug("******************Killing myself******************", "PID: ", os.Getpid())
 		os.Exit(1)
 	}
 }
@@ -85,10 +85,22 @@ func (attack *Attack) DelayResponse() {
 		return
 	}
 	if rand.Intn(HitRate) == 0 {
+		attack.log.Debug("******************Attack: DelayResponse******************", "PID: ", os.Getpid())
 		time.Sleep(DelayResponseDuration)
 	}
 }
 
+func (attack *Attack) IncorrectResponse() bool {
+	if !attack.AttackEnabled || attack.attackType != IncorrectResponse || !attack.readyByConsensus {
+		return false
+	}
+	if rand.Intn(HitRate) == 0 {
+		attack.log.Debug("******************Attack: IncorrectResponse******************", "PID: ", os.Getpid())
+		return true
+	}
+	return false
+}
+
 func (attack *Attack) UpdateConsensusReady(consensusId uint32) {
 	if consensusId > attack.ConsensusIdThreshold {
 		attack.readyByConsensus = true
diff --git a/consensus/consensus_validator.go b/consensus/consensus_validator.go
index a8c4d0ee3..c1c360df1 100644
--- a/consensus/consensus_validator.go
+++ b/consensus/consensus_validator.go
@@ -206,6 +206,9 @@ func (consensus *Consensus) processChallengeMessage(payload []byte) {
 
 	// Verify block data and the aggregated signatures
 
+	// Update readyByConsensus for attack.
+	attack.GetInstance().UpdateConsensusReady(consensusId)
+
 	// check leader Id
 	leaderPrivKey := consensus.leader.Ip + consensus.leader.Port
 	reg, _ := regexp.Compile("[^0-9]+")
@@ -217,6 +220,14 @@ func (consensus *Consensus) processChallengeMessage(payload []byte) {
 	}
 
 	consensus.mutex.Lock()
+
+	// Add attack model of IncorrectResponse.
+	if attack.GetInstance().IncorrectResponse() {
+		consensus.Log.Warn("IncorrectResponse attacked")
+		consensus.mutex.Unlock()
+		return
+	}
+
 	// check block hash
 	if bytes.Compare(blockHash[:], consensus.blockHash[:]) != 0 {
 		consensus.Log.Warn("Block hash doesn't match", "consensus", consensus)
@@ -235,9 +246,6 @@ func (consensus *Consensus) processChallengeMessage(payload []byte) {
 		// If I received previous block (which haven't been processed. I will roll up to current block if everything checks.
 	}
 
-	// Update readyByConsensus for attack.
-	attack.GetInstance().UpdateConsensusReady(consensusId)
-
 	// TODO: verify aggregated commits with real schnor cosign verification
 
 	// TODO: return the signature(response) to leader