A Lightweight Secure User Authentication and Key Agreement Protocol for Wireless Sensor Networks

Table 1

Notations.

Notation	Description
GWN	Gateway node
Ui	ith user
Sj	jth sensor node
IDi	Ui’s identity
PWi	Ui’s password
SIDj	Sj’s identity
XGWN	GWN’s secure password key
Kj	Sj’s secret password key
h ()	A secure one-way hash function
Bio	Ui’s biometric
	GWN’s private key
Xpub	GWN’s public key; Xpub =
Ti	Timestamp, i = 1, 2, ….
Ek ()/Dk ()	The symmetric encryption/decryption function using key k
G	An elliptical curve group
P	The generator of G
E/Fp	An elliptic curve E defined on a finite field Fp with order p.