Glossary: MFA, Access Control and Passwords
HOTP (HMAC-based One-time Password)
Also written: HOTP, RFC 4226
An OTP made from a shared secret and a counter that goes up by one each time a code is used or the button is pressed.
Where the book teaches it
Related terms
TOTP (Time-based One-time Password)OTP (One-time Password)HMAC (Hash-based Message Authentication Code)