TL;DR
WebAuthn (Passkeys) is phishing-resistant because each credential is bound to one domain. Magic links can be phished: a user clicks a link in a malicious email and that's it. WebAuthn is the more secure option, but it needs device support. Magic links work everywhere, and they're only as safe as the user's inbox. Want maximum security? Use WebAuthn. Need maximum compatibility? Use magic links with extra protections.
Both magic links and WebAuthn get rid of passwords. That's where the similarity ends. WebAuthn uses cryptographic credentials bound to your device, while magic links treat the email inbox as the authentication factor. Which one you pick decides what an attacker has to steal.
Security Comparison
| Security Aspect | Magic Links | WebAuthn/Passkeys |
|---|---|---|
| Phishing Resistance | Low (can be phished) | High (domain-bound) |
| Credential Theft | Email compromise | Device theft required |
| Replay Attacks | Single use tokens | Not possible |
| MITM Attacks | Vulnerable | Protected |
| Device Requirement | Email access only | Authenticator required |
| Cross-Device | Works anywhere | Sync depends on provider |
| Account Recovery | Send new link | More complex |
Phishing Resistance
Magic Link Vulnerability
Magic links can be phished. An attacker sends a fake email pointing at a lookalike site, and the user who clicks it authenticates with the attacker. Even a legitimate magic link leaks its token if it's opened on a compromised device. Forwarding the email does the same thing, just more politely.
WebAuthn Protection
WebAuthn credentials are cryptographically bound to the origin (domain). A credential for example.com won't work on examp1e.com. So even when a user is tricked onto a phishing site, authentication just fails, because the credential doesn't match. It's the strongest anti-phishing protection available.
Choose Magic Links When: You need universal compatibility and a simple sign-in. Magic links work with any email client on any device. They fit apps where users may not have an authenticator, or where easy recovery matters more than phishing resistance.
Choose WebAuthn/Passkeys When: Security comes first and you can require compatible devices. Passkeys are the strongest authentication you can offer today. Reach for them in sensitive apps and enterprise environments, anywhere a targeted phishing attack is a realistic threat.
Implementation Security
Magic Link Best Practices
- Use short expiration times (10-15 minutes)
- Single-use tokens only
- Bind tokens to session or IP
- Use secure random token generation
- Implement rate limiting
WebAuthn Best Practices
- Require user verification when available
- Support multiple authenticators per account
- Implement secure recovery mechanisms
- Use attestation for high-security scenarios
Can I use both methods together?
Yes. Many apps offer WebAuthn as the primary method with magic links as backup. Users with an authenticator get strong security, and everyone else can still sign in. Consider requiring extra verification on the magic link fallback, since that's the weaker door.
Are passkeys ready for production?
Yes. Apple, Google and Microsoft all support passkeys, and so do the major browsers. Support is wide enough for production. Keep a fallback for older devices.
Secure Your Authentication
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Further Reading
Made your choice? Here's how to secure your selected stack.