Hotp

HOTP (RFC 4226) HMAC-based one-time password reference. Counter- based OTP for hardware tokens. Covers algorithm step-by-step, Python implementation from scratch, pyotp/otpauth libraries, counter synchronization, resync protocol, look-ahead window, and security considerations vs TOTP.

bytesagain Updated 12 repo stars

File contents

HOTP Reference

HMAC-based one-time passwords.

Commands

Command Description
intro Algorithm, HOTP vs TOTP
implement Python/Node.js code
security Counter sync, resync

bytesagain/ai-skills/tree/main/hotp commit e640c1cf08

Frequently asked questions

npx skillmds@latest add bytesagain/hotp