An Enhanced Lightweight Dynamic Pseudonym Identity Based Authentication and Key Agreement Scheme Using Wireless Sensor Networks for Agriculture Monitoring

. 2019 Mar 6;19(5):1146. doi: 10.3390/s19051146

Step 1:

The user

U_{i}

inserts his/her own smartcard into card reader and enters

I D_{i}

P W_{i}

and imprints

F_{i}

on sensor device. The card reader computes

R e p (F_{i}

P_{F})

X_{F}^{*}

R P W_{i}^{*} =

h (P W_{i} ‖ X_{F}^{*})

A_{i}^{*} = h (R P W_{i}^{*} ‖ I D_{i} ‖ X_{F}^{*})

{[h (A_{i} ‖ X)]}^{*}

B_{i} \oplus h (I D_{i} ‖ R P W_{i}^{*})

and

D_{i}^{*} = h (A_{i} ‖ R P W_{i}^{*} ‖ I D_{i})

. Then,

U_{i}

verifies if

D_{i}^{*}_{=}^{?} D_{i}

holds. If condition is true then further is proceeded. Otherwise, the session is terminated.

Step 2:

The

U_{i}

enters new password

P W_{i}^{n e w}

and computes

R P W_{i}^{n e w} = h (P W_{i}^{n e w} ‖ X_{F}^{*})

B_{i}^{n e w} = h (A_{i} ‖ X) \oplus h (I D_{i} ‖ R P W_{i}^{n e w})

and

D_{i}^{n e w} = h (A_{i} ‖ R P W_{i}^{n e w} ‖ I D_{i})

. Then,

{B_{i}, D_{i}}

are replaced with

{B_{i}^{n e w}, D_{i}^{n e w}}

, respectively.