How to Enable 2FA on GitHub (Now That It's Mandatory)
GitHub requires 2FA for contributors, and for good reason: one compromised maintainer account can poison software used by millions. Here is the right way to set it up.
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In-depth guides, tips, and tutorials on two-factor authentication and online security.
Guides
How to Enable Two-Factor Authentication on LinkedIn
A hijacked LinkedIn account scams your professional network in your name and can cost you job opportunities. Here is how to enable LinkedIn 2FA with an authenticator app.
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How to Enable Two-Factor Authentication on Reddit
Old Reddit accounts with karma are traded for spam campaigns, and moderator accounts unlock whole communities. Here is how to enable Reddit 2FA in under two minutes.
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Telegram Two-Step Verification: The Setting That Stops Account Theft
Telegram accounts are hijacked through intercepted SMS codes every day. Two-step verification adds a cloud password that makes your number worthless to attackers.
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How to Enable Two-Factor Authentication on Snapchat
Snapchat accounts get hijacked for their usernames, streaks, and My Eyes Only content. Here is how to turn on Snapchat 2FA with an authenticator app and save your recovery code.
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How to Store 2FA Backup Codes So You Never Get Locked Out
Backup codes are the fire escape of two-factor authentication, and most people store them somewhere that burns down with the building. Here are storage strategies that actually survive disaster.
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How QR Codes Store Data: What's Inside Those Black and White Squares
A QR code can hold a website, a WiFi password, or your 2FA secret in a grid of squares your camera reads in milliseconds. Here is the clever engineering inside.
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What Is Hashing? A Beginner's Guide to Digital Fingerprints
Hashing turns any data into a short, unique fingerprint that cannot be reversed. It guards your passwords, verifies your downloads, and powers your 2FA codes. Here is how.
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Hex, Binary, and Decimal Explained: Number Systems for Humans
Why do programmers count in 16s and computers in 2s? A friendly tour of binary and hexadecimal, how to convert between them, and where you meet them in real life.
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