Glossary: Identity and Access Management
HOTP (HMAC-based one-time password)
Also written: HOTP
A one-time code worked out from a shared secret and a counter that goes up by one each time it is used (RFC 4226).
Where the book teaches it
Related terms
TOTP (time-based one-time password)HMAC (hash-based message authentication code)OTP (one-time password)