WebAuthn and FIDO2 Guide: Passwordless Auth
How WebAuthn works: public key credentials, authenticator types, registration vs assertion flows, and browser support status.
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Tags: security, authentication, webauthn
WebAuthn / FIDO2: Passwordless Authentication Explained Passwords are the root cause of a staggering proportion of breaches. They get phished, reused across sites, stuffed by credential lists, and stored poorly. Passkeys — built on the WebAuthn standard — eliminate passwords from the authentication equation entirely, replacing them with device-bound cryptographic keys that cannot be phished. Browser support is now universal, and the major platforms (Apple, Google, Microsoft) have bet heavily on this technology. This guide explains how it works. The Core Idea: Asymmetric Cryptography, Bound to a Device When you register a passkey, your device generates a public/private key pair. The private key never leaves the device (it lives in a Trusted Platform Module or Secure Enclave). The public…
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