Which of the following is an algorithm that computes a password from a shared secret that is used one time only?

A. TOTP
B. HOTP
C. SSO
D. SSL

B
Explanation: HMAC-based One-time Password algorithm (HOTP) is an algorithm that computes a password from a shared secret that used one time only. It uses an incrementing counter that is synchronized on both the client and the server to do this.