Certified Ethical Hacker (CEH v10) — Question 177

Todd has been asked by the security officer to purchase a counter-based authentication system. Which of the following best describes this type of system?

Answer options

• A. A biometric system that bases authentication decisions on behavioral attributes.
• B. A biometric system that bases authentication decisions on physical attributes.
• C. An authentication system that creates one-time passwords that are encrypted with secret keys.
• D. An authentication system that uses passphrases that are converted into virtual passwords.

Correct answer: C

Explanation

The correct answer is C because a counter-based authentication system generates one-time passwords that enhance security by using secret keys for encryption. Options A and B refer to biometric systems that do not align with the counter-based approach, while option D describes a different method of authentication that involves passphrases rather than a counter-based system.