Table 1.

Notations

U, S	The patient and the telecare server
I D i, P W i, B i	Identity, password, biometric of the patient
H(⋅)	Biohash function
h 1(⋅), h 2(⋅)	Hash function $h_1:{\{0,1\}}^{\ast }\to {\{0,1\}}^l$, hash function $h_2:{\{0,1\}}^{\ast }\to Z_p^{\ast }$.
x	Private key selected by S
⊕, ||	Exclusive-or operation and concatenation operation