Which REST Authentication Method Scales Best? Basic, OAuth2, JWT, or Amazon Signature

REST is a modern architectural style that defines a set of recommendations and best practices for designing web services; services built following these guidelines are called “RESTful web services.”

Security is the foundation of RESTful services, and embedding authentication and authorization mechanisms is one way to achieve it.

Common authentication/authorization standards include:

Basic Authentication

OAuth 2.0

OAuth 2.0 + JWT

Assume a backend composed of micro‑services where each user request must call several services, creating extra traffic and server load.

Basic Authentication

The oldest and simplest method sends username + password encoded with Base64. Every service call requires re‑validation, leading to additional calls; for example, 3 k requests per second multiplied by four services results in 12 k extra calls per second, causing high load.

Summary: Poor scalability and high server load.

OAuth 2.0

Uses an access token and a refresh token. After logging in, the client receives these tokens; the access token is used for all services, and the refresh token obtains a new access token when the old one expires. Although users log in less frequently, each request still requires the token to be validated by an authentication server, so the load remains significant.

Summary: Similar scalability issues as Basic authentication.

OAuth 2.0 + JSON Web Token (JWT)

Upon first login, the system returns a signed JWT that contains user information (roles, permissions) encoded in Base64. Services can verify the token locally without contacting the authentication server, eliminating extra calls and greatly reducing server load.

Summary: Good scalability; works well with micro‑services.

Amazon Signature (HTTP Signature)

Amazon uses a permanent access key and a private key to sign HTTP headers. The client signs the request headers and sends the signature; the server verifies it using the stored secret key. Only one credential exchange is needed, and the signed headers are difficult to intercept.

Summary: Secure with minimal credential transmission.

Original English article: https://yellow.systems/blog/rest-security-basics