Software Design

Passkey Registration and Login via WebAuthn

UML Sequence Diagrams · made in Skemio

Sequence diagram showing browser, WebAuthn authenticator, backend API, and database executing passkey challenge signing.

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What it shows

Private keys stay strictly inside local secure enclaves and never travel
Browsers bind origin domains to cryptographic assertions against phishing
Challenge-response payloads stop replay attacks without shared credentials

The takeaway

Passkeys bind private keys to device hardware, guaranteeing authentication signatures only match the real domain.

#Passkeys
#WebAuthn
#CyberSecurity
#AppSec
#CloudSecurity
#Architecture

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