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.

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Repository: bytesagain/ai-skills
Last source activity: March 26, 2026 at 16:28
Detected SKILL.md language: English
Stars: 12
Forks: 2

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name	hotp
version	1.0.0
description	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.
author	BytesAgain
homepage	https://bytesagain.com
source	https://github.com/bytesagain/ai-skills
tags	["hotp","otp","2fa","authentication","security","rfc4226"]

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

name	hotp
version	1.0.0
description	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.
author	BytesAgain
homepage	https://bytesagain.com
source	https://github.com/bytesagain/ai-skills
tags	["hotp","otp","2fa","authentication","security","rfc4226"]

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

hotp

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HOTP Reference

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HOTP Reference

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hotp

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HOTP Reference

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HOTP Reference

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