𝗣𝗮𝘀𝘀𝗸𝗲𝘆𝘀 𝗶𝗻 𝟮𝟬𝟮𝟲: 𝗔 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗮𝗹 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝗚𝘂𝗶𝗱𝗲
Passwords are broken. They rely on shared secrets. If a server stores a password, you double your attack surface.
Data shows the risk is massive. Stolen credentials cause most breaches. Infostealer malware harvests millions of passwords every year. Even 2FA has flaws. SMS codes face SIM swapping. TOTP tokens face real-time phishing.
Passkeys change this. They use public-key cryptography via WebAuthn and FIDO2.
How they work: • Your device creates a public-private key pair. • The private key stays in your hardware. • The server only gets the public key. • During login, your device signs a random challenge. • No secret travels across the network.
This stops phishing because passkeys bind to your specific domain. A passkey for your site will not work on a fake site.
How to implement them: Do not write raw WebAuthn code. It is easy to break. Use SimpleWebAuthn for TypeScript and Node.js. It handles the hard math for you.
Installation: npm install @simplewebauthn/server @simplewebauthn/browser
Common mistakes to avoid: • Reusing challenges. Challenges must be single-use and server-generated. • Ignoring counters. Always update the credential counter to detect cloned keys. • Forgetting recovery. If a user loses their device, they lose their account. Build a recovery path first. • Poor UX. Cross-device flows often see lower completion rates. Keep a fallback during migration.
Migration strategy:
- Stage 1: Offer passkeys as an opt-in after password login.
- Stage 2: Make passkeys the primary method once most users adopt them.
- Stage 3: Require passkeys for all new signups.
The industry has already moved. Google reports much lower account compromise rates with passkeys. Major platforms like Amazon and TikTok use them. If you do not support them, you are behind.
Source: https://dev.to/moksh/passkeys-in-2026-a-practical-engineering-guide-to-passwordless-auth-15pj