JWT Auth Without the Confusion
What JWT Actually Is JWT (JSON Web Token) is a compact, URL-safe way to transmit claims between two parties. It's not a magic security solution. It's …
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Why SSO integrations pass SIT and fail in production
Every SSO engineer has had this week. An integration is configured, tested and signed off in a lower environment. It gets promoted and within hours of…
Preventing Session Cookie Reuse Across Devices: Addressing Security Concerns with Alternative Solutions
Introduction The manager’s directive to prevent session cookie reuse across devices originates from a practical observation: authenticated session coo…
Getting Out of the Password Business
Our old authentication system logged users in with the OAuth2 client_credentials grant. If you know OAuth, you just winced. client_credentials exists …
The Complete Guide to Biometric Authentication in React Native
In today's mobile-first world, users expect authentication to be both secure and effortless. Typing passwords every time an app is opened not only imp…
Adversarial Review: The Six Lenses That Halted a Rollout
"We shipped the safety work" is a feeling, not a fact. Before you hand a shared, governed system to a team, the only thing that converts that feeling …
Idempotent Signup Emails in Node.js APIs
Signup email bugs are rarely caused by SMTP alone. In most backend systems, the real problem is that account creation, retries, and background jobs do…
Testing REST API Verification Emails Without Polluting Shared Inboxes
Verification emails look simple from the product side: user signs up, API sends a message, user clicks a link, account becomes active. On the backend …
How to Implement Biometric Authentication in a Flutter App (The Right Way)
In today's world, security is no longer optional - it's expected. Whether it's a fintech app, a fitness tracker, or an internal company tool, users wa…
Mobile App Authentication: Best Practices for iOS and Android Developers (2026)
The mobile app authentication best practices question is the single hardest one to answer well in mobile application security, because the answers tha…
Migrating from NextAuth to Better Auth in Next.js (and What the Boring Parts Actually Are)
If you've shipped a Next.js app on NextAuth (now Auth.js), you know it works. The reason people move to Better Auth usually isn't that NextAuth is bad…
Understanding OIDC Authentication Flow Visually
OpenID Connect is an identity layer built on top of OAuth 2.0 that provides a standardized way for apps to verify a user's identity and obtain basic p…
Supabase Authentication & Authorization Patterns
Supabase Authentication & Authorization Patterns Authentication and authorization are the foundation of secure applications. Supabase provides a c…
known_hosts
1. Introduction As the golden standard of secure remote access , the Secure Shell (SSH) protocol has several layers of protection. One of them involve…
Building AutoStack.Identity: A Zero-Dependency .NET 10 Library for SAML 2.0, JWT, and XML Signing
The Problem That Started This We were building a healthcare connectivity platform — multi-tenant, Azure-hosted, integrating with enterprise IdPs via S…
Логин через Telegram по-новому: разбираем OIDC-флоу oauth.telegram.org и собираем его на Python
Telegram теперь полноценный OpenID-провайдер: oauth.telegram.org, JWKS, JWT, claims. Туториалы на GitHub при этом массово показывают старый виджет с H…
How to handle hardware attestation without locking out real users
Last month I got a bug report that made me close my laptop and go for a walk. A paying user couldn't log in. Their device was rooted? Not according to…
Laravel Now Has Native Passkeys: A Complete Guide to laravel/passkeys
Originally published at hafiz.dev For a long time, adding passkeys to a Laravel app meant reaching for a third-party package, assembling WebAuthn cere…