A Provably Secure Three-Factor Authentication Protocol for Wireless Sensor Networks

Table 1

Symbols and descriptions.

Symbol	Description
	User
	Sensor
	Gateway
	Adversary
	System administrator
	Smart card
	Session key
,	GWN’s master key and identity
	’s secret value
	’s identity, password, and biometrics
	Timestamp
	Fuzzy generator function
	Fuzzy reproduction function
	Hash function