Table 1.

Comparisons of the current work on secure ITS.

	Traditional ITS Infrastructure			Blockchain-Based ITS
	[10]	[11]	[13]	[5]	[26]	[27]
Privacy	User can be traced	User can be traced	User can be traced	Anonymity	Anonymity	NA
Trust	Signature	Signature	NA	Yes	Yes	Yes
Authentication	Yes	Yes	Yes	Yes	Yes	Yes
Accountability	Yes	Yes	Yes	Yes	Yes	Yes
Attacks Protection	Bogus message attacks	Tampering	Spoofing	NA	NA	NA
Data Consistency	NA	NA	NA	Yes	Yes	Yes
Confidentiality	NA	Yes	Yes	Yes	Yes	No
Integrity	Yes	Yes	Yes	Yes	Yes	Yes
Non-repudiation	Yes	Yes	NA	Yes	Yes	Yes
Access Control	Yes	Yes	No	NA	NA	NA
Scalability	NA	NA	NA	NA	NA	NA
Implementation Limitations	Require to collect the behavior of vehicles	Require to register in a group	Broadcasting delay of messages	High computing power and memory requirement	High memory requirement	High memory requirement