A Summary of Security Techniques-Based Blockchain in IoV

Table 2

Comparison of identity authentication.

Literature	Registration authority	Functions of RA	Functions of blockchain	Method
[30]	Namecoin	Public key signature information	Publish, update, and validate	Merkle tree
[34]	The offline registration	Random number and public key	Validate	RSU collaboration
[35]	AD	SM area management	Alliance chain validation	Consensus algorithm
[36]	RTA	Public-private key for the vehicle and system key K	Validate	PoW and PBFT
[38]	CA	A certificate and two special hash functions	RSU	Pseudonyms and hashes