"Passkeys Everywhere: Shipping WebAuthn Authentication Without UX Pain"
Passkeys promise the end of phishing-prone passwords—but most teams discover that "just use WebAuthn" quickly turns into brittle edge cases, confusing prompts, and support escalation. This book is for experienced engineers, security architects, and product leaders who need to ship passkeys across real web stacks, under real operational constraints, without sacrificing conversion, accessibility, or security posture.
You'll build a precise mental model of passkeys in the FIDO2/WebAuthn ecosystem, then implement both ceremonies—registration (create) and authentication (get)—with correct parameters, account selection strategies, and cross-device/hybrid flows. The core is a rigorous server-side verification and credential lifecycle pipeline: origin/RP ID binding, signature validation, replay protection, consistent error semantics, anti-enumeration, and safe policies for disable/delete/re-enroll. Along the way, you'll learn decision frameworks for user presence vs user verification, attestation defaults, and how to design UX that avoids nag loops while staying privacy-respecting and accessible.
The book assumes comfort with web security, session design, and backend systems. It differentiates itself by treating rollout as engineering: progressive enhancement, fallbacks that don't undercut passkeys, threat modeling that includes recovery and sessions, and metrics-driven deployment playbooks so you can improve outcomes with evidence—not hope.
