In-depth guides, tips, and tutorials on two-factor authentication and online security.
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.
Read more →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.
Read more →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.
Read more →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.
Read more →Base64 turns any data into safe, printable text, and it is everywhere: emails, images in CSS, JWTs, and API keys. Here is how it works and the mistake of confusing it with encryption.
Read more →correct horse battery staple was right all along. Here is the math showing why long passphrases beat short complex passwords, and how to build ones you will actually remember.
Read more →Zero trust replaces the castle and moat model with a simple rule: verify every request, every time, from everyone. Here is what it means in practice, for companies and for your own accounts.
Read more →One click and you're logged in, but what did you just authorize? A plain language tour of OAuth and single sign on, their real security trade-offs, and how to audit your connected apps.
Read more →Your fingerprint never leaves your phone, and your face is stored as math, not a photo. Here is how biometric authentication works, where it shines, and where it should never stand alone.
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