Inefficiency of Password-changing Operation Sample Clauses

Inefficiency of Password-changing Operation. ∗ || ∗ || In a strong user authentication and key agreement proto- col, user should have a capability to update his password. In Xu et al.’s protocol, we can see that HA computes u = EN (h(PWMN ) IDMN ) with its server secret key N , and stores u into the smart card. It means that the smart card needs to replace the old parameter u with the new parameter u . Since the password PWMN is encrypted by HA using his secret key N , MN has to resubmit his new PWM∗ N to HA, and HA replaces the original u in MN’s smart card with u = EN (h(PWM∗ N ) IDMN ). MN has to communicate with HA through the smart card and the wireless network. This makes the password-changing op- eration inefficient.
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