An Enhanced RFID-Based Authentication Protocol using PUF for Vehicular Cloud Computing

Table 4

Notations along with their descriptions.

Symbol	Description
	tag, reader, and cloud server
	Unique identities of and
	Password of
	Long-term private secret key of the
	Operations of bitwise concatenation and bitwise XOR
	Session key established between and
	Physically unclonable function
	Cryptographic collision-resistant one-way hash function
	Random numbers
	Timestamps used at transmission
	Maximum threshold transmission delay allowed
	Validation check, if expression matches or not
	An adversary