Open2FA

Open2FA is a free and open-source 2FA generator that helps you create secure tokens anytime, anywhere. Lightweight, fast, and privacy-friendly – no accounts, no tracking, just instant codes.

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作者: airpl4ne
今日安裝: 0
安裝總數: 3
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版本: 1.0
建立日期: 2025-08-30
更新日期: 2025-08-30
尺寸: 29.9 KB
授權條款: MIT
腳本執行於: 所有網站

Open2FA — a free and open-source generator for two-factor authentication (2FA) codes. Lightweight, fast, and privacy-first.

✨ Features

Open-source: transparent and community-driven.
Lightweight: no tracking, no telemetry.
Standards compliant: supports TOTP (time-based) and HOTP (counter-based).
Simple: paste an otpauth URI or enter a Base32 secret manually.
Private: no account required, no server storage.

🔧 How it works

Paste your 2FA setup link (otpauth://) or manually enter a Base32 secret.
Open2FA parses the parameters (algorithm, digits, period, counter).
The tool generates OTP codes instantly according to the specification.

Example URIs:

otpauth://totp/Service:username?secret=JBSWY3DPEHPK3PXP&issuer=Service&digits=6&period=30
otpauth://hotp/Service?secret=JBSWY3DPEHPK3PXP&issuer=Service&digits=6&counter=1

🛡️ Security & Privacy

No tracking or analytics.
No server-side storage: your secrets never leave your device.
Open code: fully verifiable and community-audited.

Note: Always back up your secrets and recovery codes safely. Losing them may lock you out of your account.

🚀 Quick Start

Open Open2FA.
Paste an otpauth:// URI or enter a Base32 secret.
For TOTP: codes refresh every period seconds (default: 30).

For HOTP: press "Next" to increment the counter.

⚙️ Parameters

algorithm: SHA1 (default), SHA256, SHA512
digits: 6 (default), 7, 8
period (TOTP): 30 (default)
counter (HOTP): integer value

❓ FAQ

Q: I only have a Base32 secret, no otpauth link. What do I do?

A: Use "Enter secret" and manually specify the parameters (digits, period, algorithm).

Q: My TOTP codes are incorrect.

A: Check your system clock. TOTP is time-sensitive and requires accurate system time.

Q: Does Open2FA save my secrets?

A: No. All data is processed locally on your device.

Q: Does it support QR codes?

A: If your version includes a QR scanner, you may use it. Otherwise, decode the QR code with another tool and paste the otpauth link.

🧩 Compatibility

RFC 4226 (HOTP) compliant.
RFC 6238 (TOTP) compliant.
Works with most services that provide standard 2FA.

🗂️ Permissions

Clipboard (optional): allows faster paste of secrets or codes.
No sensitive or unnecessary permissions required.

🧪 Test Vectors

You can verify correctness with known test values:

Secret (Base32): JBSWY3DPEHPK3PXP
TOTP (SHA1, 6 digits, 30s): matches reference implementations
HOTP (counter-based): produces a valid sequence of codes

🔄 Changelog

v1.0.0: Initial release with TOTP/HOTP support, otpauth parser, copy-to-clipboard.

🤝 Contributing

Report bugs or suggest improvements.
Contribute code following the project’s style and test guidelines.

📜 License

Licensed under a permissive open-source license (MIT). Free to use, modify, and share.

⚠️ Disclaimer

Open2FA provides standard-compliant 2FA code generation. You are responsible for keeping your secrets safe and securing your accounts. Always enable backup recovery methods for critical services.