1. Efficient password authenticated key agreement using smart cards
Author: Wen-Shenq Juang
Source: Computers and Security, vol. 23, pp , 2004.
Speaker: Jung-San Lee
Date: 2004/10/06

2. Notations x: the secret key of the server S
Ek(m): the encryption of the message m with the encryption key k
Dk(m): the decryption of the message m with the decryption key k
h(): a public one-way hash function
ru, rs: two random numbers
N1, N2: two nonce
sk: the negotiated session key

3. The Proposed Scheme Registration Phase
Login and session key agreement phase

4. Registration phase OK User Ui Server S IDi, PWi Vi = h(IDi, x),
Wi = Vi  PWi
Smart card [IDi, Wi]

5. Login and key agreement phase
IDi, PWi
User Ui
Server S
Vi = Wi  PWi
Vi = h(IDi, x) OK
Computes h(IDi|| N1)
sk= h(ru, rs, Vi)
Dsk(Esk(N2+1))

6. Conclusions
Simple
Efficient