Mona Sata

SAML, OAuth 2.0, and OpenID Connect are the three standards that govern how identity is verified and access is granted across enterprise environments, but most comparisons stop at definitions. This guide covers what each protocol actually does, what token it issues, and how they work together in a mature identity stack. It addresses the decision framework most articles skip: not just which protocol fits which architecture, but which fits the operational reality of your workforce. That includes the specific gap these protocols share in frontline and shared-device environments; healthcare wards, factory floors, warehouses, and retail counters, where the one-user-one-device assumption quietly breaks security. If you're evaluating protocol selection or auditing your IAM stack, this is the comparison built for that decision.

OIDC and OAuth are two of the most widely used identity protocols, and two of the most commonly confused. OAuth 2.0 governs authorization: what an application is allowed to access on a user's behalf. OpenID Connect adds the identity layer: it confirms who the user actually is, using a signed ID token built on top of the OAuth framework. Using one where the other is needed is not just an architectural mistake; it is a documented security risk that shows up in breach post-mortems. This guide covers how each protocol works, where they differ, how they are used together, and why the distinction matters most in environments where multiple workers share the same device.

Virtual desktop infrastructure is the technology that hosts desktop environments on centralized servers and delivers them to users over a network, from any device. Most organizations understand VDI as a remote work tool, but its strongest use case is in shared-device environments where multiple workers rotate through the same terminals across shifts. This guide covers how VDI works, the difference between persistent and non-persistent deployments, where VDI fits inside a zero-trust security architecture, and where traditional VDI assumptions break down for frontline operations in healthcare, manufacturing, logistics, and retail.

The client-to-authenticator protocol (CTAP) is the FIDO Alliance specification that governs how a browser or operating system communicates with an external authenticator, such as a security key, badge, or phone, over USB, NFC, or Bluetooth. Most organizations adopting passwordless authentication understand WebAuthn and FIDO2 at a surface level but miss how CTAP lies beneath both and enables hardware-bound authentication. The gap widens in operational environments: shared workstations, shift-based terminals, and frontline devices where standard authentication assumptions, one worker, one device, do not hold.

OAuth (Open Authorization) is an open standard protocol that lets applications access user data without ever handling a password. Most teams understand the surface-level concept but miss the implementation nuances that matter in practice: the right grant type, token lifecycle management, the deprecation of the implicit flow, and what changes with OAuth 2.1. This guide covers what OAuth is, how it works, which grant type fits each scenario, how it compares to OIDC, SAML, and SSO, and where token-based authorization becomes especially critical in shared-device and frontline environments.

Proximity authentication verifies identity through physical presence, not passwords or PINs, using technologies like BLE, NFC, and Wi-Fi to detect how close a paired device is to a host system. When the user approaches, the session opens automatically. When they walk away, it locks. This blog covers how proximity authentication works, which communication protocols power it, how it compares to badge tap and biometrics, and where it delivers the strongest security and operational value. It also maps proximity authentication to HIPAA, CMMC, and PCI DSS compliance requirements and outlines what to consider before deployment, including token loss, signal interference, and fallback planning.