Efficient Hierarchical Authentication Protocol for Multiserver Architecture

Table 2

Notations used in the proposed protocol.

Notation	Description
	The registration center
	The user
	The service provider
	The adversary
	The identity of user
	The identity of service provider
	The password of a user
	The user’s personal biometrics
	The biometric key
e	The private key expire parameter
	Random numbers from
	The session key
	Concatenation operation
	The authentication right tree
	The authentication right tree on service provider side
	The authentication right parameters
	The node of the authentication right tree
	The subnode of
	The fuzzy-extractor generation procedure
	The deterministic reproduction procedure
	Secure one-way hash functions
	ID revocation list