Table 6.

Comparative analysis among reviews.

ID	Protection against Attacks	Methods and Tools	Based on Technology	Simulators	Evaluation Metrics
RV01	DoS	PKI
	Tampering	ECC
	Sybil	IBPKC
	Replay
	Impersonation
RV02	DoS		Blockchain
	Tampering
	Impersonation
	Sybil
	Replay
	Eavesdropping
	MitM
RV03	DoS	PKC	Cloud computing	SUMO	Computational cost
	Tampering	SKC		OMNET++	Communication overhead
	MitM	IBPKC		NS-2
	Eavesdropping	PKI		NS-3
	Impersonation	Hash functions		Veins
	Replay	ECC
	Sybil
RV04	Tampering
	Impersonation
	Sybil
	MitM
	DoS
	Eavesdropping
	Replay
	Bogus
RV05	DoS	PKI	Blockchain
	Tampering	Hash functions	Fog computing
	Eavesdropping
	Sybil
	Replay
RV06	DoS	PKI
	Bogus
	Impersonation
	Eavesdropping
RV07	DoS	PKI
	Sybil	PKC
	MitM	SKC
	Tampering
	Impersonation
	Replay
RV08	MitM	PKI	Blockchain
	Impersonation	IBPKC
	Tampering
	Eavesdropping
RV09	Tampering	PKI			Computational cost
	Eavesdropping	ECC			Communication overhead
		SKC			Average delay
		IBPKC
Our review	MitM	ECC	Blockchain	SUMO	Computational cost
	Replay	CBC	Edge computing	OMNet++	Communication overhead
	Modification	PKI	SDN	NS-3	Transmission delay
	Tampering	PKC	NFV	NS-2	Propagation delay
	DoS	SKC	Fog computing	Veins	Packet Delivery Ratio
	Session Key Disclosure	IBPKC	Group Formation Criteria	SSGA	Packet Loss Ratio
	Impersonation	Hash functions	Cloud computing	MOVE	Accuracy
	Sybil	Pseudonyms			Trust Value
	Forgery				Data Receiving Rate
	Bogus				Storage Cost
	Eavesdropping				Storage Overhead
	Plaintext				Roaming Latency
	Key Leakage				Cyphertext Length
	Chosen Message				Energy Consumption
	Ciphertext				Throughput
	Beacon Transmission Denial				Attack Detection Rate
					Average Delay
					False Accept Rate