A Novel Multiserver Authentication Protocol with Multifactors for Cloud Service

Table 1

Notations.

Notation	Description
	The identity of the entity
	The secret key of the entity
	Authentication center
	Smart card
	The master key of authentication center
	The private/public key of authentication center
	The private/public key of sever
	The password of user
	The fingerprint information of user
	The generation time of
	The security length parameter
	Cryptographic one-way hash function, satisfying
	String concatenation
	Exclusive-or operation