📚 2FA Sikkerhetssenter · Veiledninger og kunnskapsbase

Tofaktorautentisering veiledninger og sikkerhetsakademi

In-depth tutorials covering authenticator phone transfers, emergency recovery when keys are lost, cryptographic RFC 6238 principles, and comprehensive authenticator app reviews.

💡 Core Topics:

📱 Oppsett og migrering 🆘 Nødgjenoppretting ⏱️ TOTP-kryptografi 🛡️ Anti-phishing 🏢 Sky og bedrift

12 Comprehensive Guides Available

📱 Migration 8 min lesing

Slik overfører du Google Authenticator til en ny telefon (2026 komplett veiledning)

Step-by-step tutorial on exporting accounts, understanding Google Cloud Sync privacy trade-offs, and securely wiping old devices without losing access.

2FA-Tool Team · October 2026 Read Guide →

🐙 Account Setup 7 min lesing

Complete Guide to GitHub 2FA Setup, SMS Fallback & Recovery Codes

Master GitHub mandatory 2FA policy compliance, secure storage of recovery codes, SSH key permissions, and emergency lockout resolution.

2FA-Tool Team · October 2026 Read Guide →

🆘 Emergency 9 min lesing

Lost Your 2FA Phone? How to Recover Accounts Without Authenticator App

Detailed disaster recovery workflows for Google, Microsoft, Apple, Steam, Binance, Twitter, and Discord when your authenticator device is lost or broken.

2FA-Tool Team · October 2026 Read Guide →

⏱️ Cryptography 8 min lesing

TOTP vs HOTP Explained: Core Differences, Security & Working Principles

From RFC 4226 counter-based tokens to RFC 6238 time-step windows. Technical comparison of hash truncation, desync vulnerabilities, and modern adoption.

2FA-Tool Team · October 2026 Read Guide →

⚠️ Security Alert 8 min lesing

Why SMS 2FA Is Dangerous: SIM Swapping, SS7 Vulnerabilities & Phishing Explained

How attackers hijack phone numbers, intercept carrier SMS tokens, and bypass SMS authentication with reverse proxies like Evilginx. Why NIST deprecated SMS 2FA.

2FA-Tool Team · October 2026 Read Guide →

🪙 Crypto & Finance 8 min lesing

Kryptosikkerhet Guide: Best 2FA & Multi-Factor Setup for Binance & Exchanges

Protecting high-value exchange accounts: withdrawal address whitelists, anti-phishing codes, YubiKey hardware keys, and 16-character secret key cold backup.

2FA-Tool Team · October 2026 Read Guide →

🛡️ App-anmeldelser 10 min lesing

Best Authenticator Apps of 2026: Aegis vs 2FAS vs Bitwarden vs Google vs Microsoft

Head-to-head comparison of top TOTP apps. Open-source transparency, encrypted offline backups, cloud synchronization, wearable support, and threat model analysis.

2FA-Tool Team · October 2026 Read Guide →

💻 Engineering 12 min lesing

How TOTP Works: Implementing RFC 6238 Algorithm in Python, JavaScript & Go

Cryptographic walkthrough: Base32 decoding, 30-second time calculation, HMAC-SHA1 hashing, dynamic truncation, and 6-digit extraction with runnable code.

2FA-Tool Team · October 2026 Read Guide →

💬 Community 7 min lesing

Discord 2FA Guide: How to Enable Two-Factor, Backup Codes & SMS Recovery

Safeguard your Discord account and server ownership against token grabbers and phishing. Setting up authenticator apps, generating 8-digit backup codes.

2FA-Tool Team · October 2026 Read Guide →

🎮 Gaming 8 min lesing

Steam Guard Mobile Authenticator: Setup, Trade Holds & Account Recovery Guide

In-depth guide to Steam Guard 5-digit alphanumeric tokens, avoiding 15-day trade escrow, R-code emergency revocation, and transferring Steam Guard smoothly.

2FA-Tool Team · October 2026 Read Guide →

🏢 Bedrift 8 min lesing

Microsoft Authenticator: Passwordless Login, Number Matching & TOTP Setup

Combat MFA fatigue attacks with number matching, configure passwordless phone sign-in, and sync accounts across iOS, Android, and Office 365 / Azure AD.

2FA-Tool Team · October 2026 Read Guide →

☁️ Bedrift 9 min lesing

AWS MFA Best Practices: Securing Root Account & IAM Users with Virtual MFA

Cloud compliance baseline: locking AWS Root account with multi-MFA, enforcing IAM policy-level MFA conditions, and CLI temporary session token generation.

2FA-Tool Team · October 2026 Read Guide →

Hands-On Security Utilities

Ready to Test Your Two-Factor Key?

Put your knowledge into action. Calculate dynamic 6-digit codes with our zero-knowledge client-side generator or inspect clock drift with the Sikkerhetsverktøykasse.

Åpne 2FA-generator Open Sikkerhetsverktøykasse