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Which one of the following authentication mechanisms cr…

Which one of the following authentication mechanisms creates a problem for mobile users?

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A.
Mechanisms based on IP addresses

B.
Mechanism with reusable passwords

C.
One-time password mechanism.

D.
Challenge response mechanism.

Explanation:
Authentication mechanisms based on IP addresses are useful if a user has a fixed IP address. This could be a
fixed IP address at work or even a fixed IP address at home. With authentication mechanisms based on IP
addresses, a user can access a resource only from a defined IP address.
However, authentication mechanisms based on IP addresses are a problem for mobile users. This is because
mobile users will connect to different networks on their travels such as different WiFi networks or different
mobile networks. This means that the public IP address that the mobile user will be connecting from will change
frequently.
Incorrect Answers:
B: Authentication mechanisms with reusable passwords are not a problem for mobile users. As long as the
mobile user knows the password, he can access the resource.
C: One-time password authentication mechanisms are not a problem for mobile users. The mobile user will
have a token device that provides the one-time password which will enable the user to access the resource.
D: Challenge response authentication mechanisms are not a problem for mobile users. As long as the user has
network connectivity to the authenticating server (usually over the Internet) the challenge-responseauthentication will succeed.


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