---
taskmaster_id: "2.3"
status: "done"
priority: "high"
depends_on: ["1"]
parent_id: "2"
source: "taskmaster"
generated_at: "2026-05-28T11:49:27.076Z"
---

# 2.3 - Replace stubbed passkey/WebAuthn flow

- [x] 2.3 - Replace stubbed passkey/WebAuthn flow #taskmaster #priority/high #status/done ⏫ 🆔 tm-2-3 ⛔ tm-1

## Metadata

| Field | Value |
| --- | --- |
| Taskmaster ID | 2.3 |
| Status | done |
| Priority | high |
| Dependencies | 1 |
| Parent | 2 - Implement platform audit remediation plan |

## Description

Implement production-grade WebAuthn registration/authentication and shared challenge storage.

## Details

Use real attestation/assertion verification, Redis-backed TTL challenges, refresh-token persistence/rotation, and deterministic malformed/reused/expired challenge errors.

## Verification

Registration, login, replay, expired challenge, and refresh-token continuity tests pass.
