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?
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.
A counter-based authentication system is based on the HOTP (HMAC-Based One-Time Password) algorithm. It uses a shared secret and a moving counter to generate a one-time password (OTP). Each time the counter is incremented, a new OTP is generated and encrypted using the secret key.
Reference – CEH v13 Official Study Guide:
Module 5: System Hacking
Quote:
“HOTP generates a one-time password using a counter value and a secret key. This is a form of two-factor authentication, and the passwords are encrypted.”
Incorrect Options Explained:
A & B. These describe biometric systems, not counter-based OTPs.
D. Virtual passwords from passphrases are not counter-based systems.
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