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 sync

SKILL.md

GitHub

HOTP Reference

HMAC-based one-time passwords.

Commands

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

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