Lightweight CLI for one-time passcodes
a2fa is a no-cost command-line program that produces and checks one-time passcodes (OTPs). It’s built to simplify two-factor authentication by creating short-lived, cryptographically sound codes that improve account protection. The tool favors Windows users who prefer terminal workflows, making it a practical pick for developers and power users who work at the command prompt.
Primary capabilities
- Verify one-time codes to confirm their authenticity before granting access.
- Create time- and counter-based OTPs (TOTP/HOTP), ensuring each code is unique and expires appropriately.
- Offer a compact, purpose-driven interface focused on secure credential handling without unnecessary complexity.
Who benefits most
a2fa is aimed at people who:
- Manage services or scripts from Windows consoles and want lightweight MFA support.
- Build or test authentication flows and need a simple utility to generate and validate codes.
- Prefer minimal dependencies and a straightforward, script-friendly tool over full GUI applications.
Security and usability notes
The utility emphasizes security through temporary, deterministic codes and supports common OTP standards. Its command-line orientation makes automation and integration into CI/CD or administrative scripts easy, while keeping the interaction terse and predictable.
Alternatives and related downloads
- Intel network adapter driver for Windows 7 — a free driver package that addresses network hardware compatibility (note: this is unrelated to OTP functionality but commonly listed among Windows utilities).
- Full-featured MFA applications and cloud-based multi-factor services for users seeking graphical interfaces, centralized management, or enterprise features.
Quick start tips
- Use a secure seed and keep backups of any secret keys you provision.
- Automate validation steps in scripts to reduce manual copy-paste errors.
- Test both TOTP and HOTP modes if you plan to support devices with differing capabilities.
Technical
Title
a2fa
Requirements
- Windows
Language
No language has been specified.
Available languages
License
- Free
Latest update
2025-12-01
Author
csyezheng
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