Remember HOTP
Full name: HMAC-Based One-Time Password
Memory aid: H moves with a counter, while TOTP moves with time.
Counter synchronization is relevant to HOTP validation.
Study area: Identity & access · Batch 3
Relevant study for: CompTIA Security+ SY0-701 · ISC2 CISSP 2024 outline · ISC2 SSCP · Security, Compliance, and Identity Fundamentals SC-900 · Identity and Access Administrator SC-300 · ISC2 CC · Cybersecurity Architect SC-100
Practice with exam flashcards →Cybersecurity & Identity / Knowledge library
HOTP — HMAC-Based One-Time Password
Derives one-time passcodes from a secret and counter.
Why learn HOTP — HMAC-Based One-Time Password?
Derives one-time passcodes from a secret and counter.
Where it came from
Counter synchronization is relevant to HOTP validation.
- Memory aid (a learning cue, not the expansion): H moves with a counter, while TOTP moves with time.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand HOTP: HMAC-Based One-Time Password.
- Recall this memory aid: H moves with a counter, while TOTP moves with time.
- Explain the practical use: Derives one-time passcodes from a secret and counter.
- Explain this distinction: Counter synchronization is relevant to HOTP validation.
- Identify HOTP in a device specification, architecture diagram, or system inventory.
Documentation and sources
- IETF RFC 4226 (www.rfc-editor.org)