Todd has been asked by the security officer to purchase a counter-basedauthentication system. Which of the following best describes what this type ofsystem is?

A.
A biometric system that bases authentication decisions on physical attributes

B.
An authentication system that creates one-time passwords that are encrypted with secret keys

C.
A biometric system that bases authentication decisions on behavioral attributes

D.
An authentication system that uses passphrases that are converted into virtualpasswords

Explanation:
There are two main types of synchronized token one-time password generators,counter-based and time-based. If the token device and authentication service usecounter-synchronization, the user will need to initiate the logon sequence on thecomputer and push a button on the token device. This causes the token device and theauthentication service to advance to the next authentication value. This value and abase secret are hashed and displayed to the user. This is the users one-timepassword. nter-based is also referred to as event-based.