🔑 2FA Dynamic Code Generator
Támogatja az egyedi kulcsot és a kötegelt többsoros módot · 30 másodperces élő visszaszámlálás
Automatikusan frissül 30 másodpercenként
Olvassa be Google Authenticator vagy más 2FA alkalmazással a párosításhoz
Kötegelten generált kódok
0 érvényes 30sAll secret keys and generated passcodes are processed locally in your browser sandbox using the standard Web Crypto API. No data is ever transmitted to or stored on external servers.
Kiemelt 2FA Biztonsági és Megerősítési Útmutatók
Magas szintű kriptográfiai megfelelőség és megalkuvás nélküli felhasználói adatvédelem
Hogyan vigyük át a Google Authenticatort új telefonra
Cloud sync trade-offs, optical QR export protocols, secure old-phone wiping, offline redundancy & NTP clock drift troubleshooting.
Elvesztette a 2FA telefonját? Hogyan állíthatja helyre fiókjait az alkalmazás nélkül
First 15-minute emergency response SOP, cross-platform recovery paths (Google, Microsoft, Steam, Binance, Apple) & 3-2-1 backup rules.
GitHub 2FA beállítás, SMS tartalék & helyreállítási kódok kézikönyv
Mandatory 2FA enforcement policy, 3-tier recovery code cold storage, SSH key signature challenges & lock-out prevention strategies.
Miért veszélyes az SMS 2FA: SIM-csere & SS7 sebezhetőségek
SIM swap social engineering vectors, SS7 cellular interception, real-time Evilginx phishing proxies & NIST deprecation guidelines.
Kripto Biztonság Guide: Best 2FA Setup for Binance & Tőzsdék
Withdrawal whitelisting, anti-phishing codes, hardware FIDO2 + TOTP hybrid architecture & cold storage for 16-character keys.
2026 legjobb Authenticator alkalmazásai: Aegis vs 2FAS vs Bitwarden
Comprehensive side-by-side comparison of 5 leading authenticator apps: encryption models, cloud sync vs offline, and security posture.
Base32 formátumhibákat vagy eszköz óraeltérést tapasztal?
Explore our specialized 2FA Security Toolbox: Base32 Key Auto-Fixer, otpauth:// URI Inspector, and millisecond-accurate NTP clock drift detection.
2FA módszerek összehasonlítása: Miért a TOTP az arany standard
Comparing security levels, SIM swapping resistance, cost, and availability
| Módszer | Biztonsági szint | SIM-csere elleni védelem | Offline működés | Költség | Kényelem | Fő felhasználási területek |
|---|---|---|---|---|---|---|
| ★ TOTP (Ez az eszköz) | Magas (Ajánlott) | Védett (Nincs mobilátvitel) | 100% Offline | Ingyenes (Web / Alkalmazások) | Nagyon magas | Google, GitHub, AWS, Binance |
| SMS ellenőrző kód | Alacsony - Közepes | Sebezhető (SIM-eltérítés) | Mobilhálózati térerőt igényel | Alacsony (SIM-kártya) | Magas | Régebbi fogyasztói bejelentkezések |
| E-mail ellenőrző kód | Közepes | Az e-mail biztonságától függ | Internetet igényel | Ingyenes | Közepes | Másodlagos tartalék megoldás |
| FIDO2 / Hardveres kulcsok | Magasest (Anti-Phishing) | Védett | Támogatott | 25 - 70 USD (Hardver) | Közepes (Must Carry) | Magas-value enterprise infra |
Platform beállítási útmutatók & mentési szabályok
Hogyan engedélyezze a 2FA-t és őrizze meg a helyreállítási kulcsokat a fő platformokon
Go to Settings -> Password and authentication -> Two-factor authentication. Click Enable 2FA, choose "Set up using an app", and copy the Base32 plaintext key.
Navigate to myaccount.google.com -> Security -> 2-Step Verification. Scroll down to "Authenticator app" and click "Can't scan it?" to copy the 32-character plaintext secret.
Under Security -> Authenticator App, click Enable. Write down the 16-character Reset Key on paper and store it in a physical safe.
Hogyan működik az RFC 6238 TOTP algoritmus?
Mathematical steps turning shared secrets and Unix timestamps into synchronized codes
The Time-Based One-Time Password algorithm (TOTP) is defined in IETF RFC 6238. It converts continuous timestamps into discrete 30-second counters and executes HMAC-SHA1 hashing:
Időlépés kvantálás
Ossza el az aktuális Unix másodperceket a 30 másodperces intervallummal: T = floor(Epoch / 30)
Base32 dekódolás
Alakítsa vissza a Base32 karakterláncot (RFC 4648) nyers kriptográfiai kulcsbájtokká.
HMAC-SHA1 hash készítés
Hash the 8-byte big-endian time counter with the secret key to yield a 20-byte digest.
Dinamikus csonkítás (Dynamic Truncation)
Use the lowest 4 bits of the last byte as an offset to extract a 31-bit unsigned integer.
Modulo 10^6
Take modulo 1,000,000: Code = Value % 10^6, zero-padded to 6 digits.
Code Shows "Invalid"? 4 Common Causes
99% of 2FA validation errors arise from local clock drift or character confusion
If your computer or phone clock drifts by even 15 seconds, your code falls into a different time window. Solution: Enable "Set Time Automatically (NTP)" in your OS settings.
Base32 contains A-Z and 2-7. It never contains 0, 1, 8, 9. Do not confuse letter O with number 0, or letter I/L with number 1.
If you clicked "Reset 2FA" on the platform multiple times, previous keys become invalid instantly. Ensure you are using the most recently generated secret.
Submitting when the progress bar has only 1-2 seconds left may cause the code to expire in transit. Wait for a fresh 30-second cycle.
Recommended Authenticator Apps
Choose the optimal 2FA client for your security workflow
Google Authenticator
Most PopularClean interface, supports Google-fiók cloud backup, or can be used in offline local-only mode.
2FAS (Open Source)
Recommended100% open-source, zero data tracking. End-to-end encrypted backup to iCloud/Google Drive with browser extension pairing.
1Password / Bitwarden
ProductivityStores TOTP keys alongside passwords for seamless one-click auto-fill across all browsers and desktop apps.
Gyakran Ismételt Kérdések (GYIK)
Detailed answers regarding 2FA security, offline operation, and batch formatting
Absolutely not. This tool operates 100% on the client side (inside your browser). All Base32 decoding and HMAC-SHA1 hash computations are performed in browser memory using the W3C standard Web Crypto API.
Your secret keys never leave your device. You can verify this using browser DevTools (F12) -> Network tab, or by running the tool in airplane mode without an internet connection.
Yes, absolutely identical. This tool strictly implements the IETF international standard RFC 6238 (TOTP).
With the same Base32 secret key and synchronized system time, it generates the exact same 6-digit codes as Google Authenticator, Microsoft Authenticator, 1Password, Bitwarden, or any other standard authenticator app.
By appending your secret key after a hash fragment like https://2fa-tool.com/hu/#JBSWY3DPEHPK3PXP, the page instantly auto-fills the key and computes codes upon opening.
Under HTTP protocol specifications, everything after the '#' symbol is evaluated solely within your local browser and is never transmitted to web servers, leaving zero server logs. However, take care not to share screen views or saved URL links with others.
Batch Mode accepts one account per line and flexibly supports raw Base32 keys, Label: SecretKey, Label, SecretKey, or standard otpauth://totp/... URIs.
You can parse dozens or hundreds of accounts concurrently and copy all generated codes in one click.
Yes, it is fully responsive. Whether you are using Safari on iPhone or Chrome on Android, you enjoy the exact same instant local Web Crypto API cryptographic calculations, interactive countdown animations, and one-tap copy functionality.
Base32 is an encoding format designed for human readability that represents binary data using only 32 characters: uppercase/lowercase letters A-Z and digits 2-7. It deliberately excludes ambiguous characters like 0, 1, O, and I to minimize transcription errors.
Our tool automatically normalizes spaces, hyphens, and padding '=' signs.
Yes. All styles, fonts, and QR rendering scripts are hosted locally on our static server.
Once the page has loaded in your browser, you can disconnect Wi-Fi or turn on Airplane Mode; the tool continues to compute dynamic TOTP codes in real time relying solely on your local device clock.
It is 100% free. No user registration, account sign-up, or personal information (such as email or phone number) is ever required. You can use it anytime with full functionality and zero restrictions.