Which of the following is the most reliable authentication device?

A.
Variable callback system

B.
Smart Card system

C.
Fixed callback system

D.
Combination of variable and fixed callback system.

Explanation:
The smart card, an intelligent token, is a credit card sized plastic card embedded with an integrated
circuit chip. It provides not only memory capacity, but computational capability as well. The selfcontainment of smart card makes it resistant to attack as it does not need to depend upon
potentially vulnerable external resources. Because of this characteristic, smart cards are often used
in different applications which require strong security protection and authentication. Option B is the
most correct option, this is because Callback systems are not considered very reliable in the CISSP
examination, Smart cards can also provide 2 mode authentication. “Caller ID and callback options
are great, but they are usually not practical because they require users to call in from a static phone
number each time they access the network. Most users are accessing the network remotely because
they are on the road and moving from place to place.” Pg. 428 Shon Harris: All-In-One CISSP
Certification Guide.