# Authentication **Authentication** is the process of **verifying the identity** of a user or system that attempts to access an application or service.\ It answers the fundamental security question: > **“Who are you?”** In most systems, users are identified by a **user ID**, and authentication is completed when the user proves ownership of that identity by presenting a valid **credential**, such as a password, token, or cryptographic proof. Authentication is a foundational control in security and compliance, as it establishes a trusted identity before any access decisions are made. *** ### Role of Authentication in Security & Compliance Authentication is critical because it: * Establishes a trusted identity * Enables authorization and access control * Supports auditing and accountability * Helps meet compliance requirements related to identity management Without strong authentication, other security controls (such as authorization or auditing) lose their effectiveness. *** ### Common Authentication Approaches There are several widely used authentication mechanisms in modern web and enterprise applications. The following approaches are commonly encountered. *** #### HTTP Basic Authentication HTTP Basic Authentication is one of the simplest authentication mechanisms. **How it works** * The client sends a **username and password** with each request * Credentials are included in the HTTP header **Characteristics** * Does not rely on cookies, sessions, or login pages * Lightweight and easy to implement * Requires HTTPS to prevent credential exposure **Considerations** * Credentials are transmitted with every request * Not suitable for high‑security or user‑friendly applications without additional protections *** #### Token‑ or Key‑Based Authentication Token‑ or key‑based authentication improves upon basic authentication by replacing repeated credential exchange with a **unique token or key**. **How it works** * A unique key or token is generated for a user * The token represents the authenticated identity * Subsequent requests use the token instead of username/password **Characteristics** * Reduces exposure of primary credentials * Commonly used in APIs and service‑to‑service communication * Enables stateless authentication **Examples** * API keys * Bearer tokens * Session tokens *** #### OAuth‑Based Authentication OAuth is a modern framework that combines **authentication and authorization**. **How it works** * The user authenticates with a trusted identity provider * The provider issues an access token * The token is presented to the requesting application * The application validates the token independently **Characteristics** * Delegates identity management to an authorization server * Tokens can be validated without re‑authenticating the user * Widely used for integrations and third‑party access **Common use cases** * Single Sign‑On (SSO) * Third‑party application access * Federated identity scenarios *** ### Choosing the Right Authentication Method The choice of authentication mechanism depends on: * Application type (web, mobile, API, service) * Security requirements * User experience considerations * Compliance and regulatory obligations In enterprise systems, authentication mechanisms are often layered and combined with additional controls such as encryption, monitoring, and access governance. *** ### Summary **Authentication** is the cornerstone of application security and compliance. It defines how identities are established and trusted before granting access to resources. Key takeaways: * Authentication answers **“Who are you?”** * It enables authorization, auditing, and accountability * Multiple authentication approaches exist to fit different use cases * Strong authentication is essential for secure and compliant systems A robust authentication strategy lays the foundation for building **secure, scalable, and compliant applications** on the ONEWEB platform. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.onewebstack.com/building-apps/security-and-compliance/authentication.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.