Symbol

Description

Ui, Sj

IDi, SIDj

PWi

bi

SC

DIDi, DIDGWN

Ki, Kj

SK

ai, ri, rg, rj

h(.)

f(.)

F(.)

TS

EK(.), DK(.)

User i and sensor node j

Identities of Ui and Sj

Ui’s password

Ui’s biometric

Smartcard of Ui

Dynamic identities of Ui and GWN

Keys generated by Ui and Sj

Session key established between entities

Random numbers

One way hash function

Decoding function

Fuzzy commitment

Time stamp

Symmetric encryption and decryption with K

Exclusive OR operation

Message concatenation operation