#OAuth
15 articles
What are Sender-Constrained Tokens? An Introduction to mTLS (RFC 8705) and DPoP (RFC 9449)
Explains sender-constrained tokens that address the weakness of bearer tokens, using mTLS (RFC 8705) and DPoP (RFC 9449) to bind a token to its sender, plus Resource Indicators (RFC 8707) that narrow the audience.
What is Dynamic Client Registration (DCR)? An Introduction to RFC 7591 and 7592
Explains Dynamic Client Registration (RFC 7591) and Client Registration Management (RFC 7592), which register and manage OAuth clients via an API. Covers the registration endpoint, registration access token, and security considerations.
Access Token Validation and Revocation: Introspection, JWT AT, and Revocation
Compares the two access token approaches (opaque + Introspection / JWT access tokens) and how each is validated, plus revocation via Token Revocation. Covers RFC 7662, RFC 9068, and RFC 7009.
What are OpenID Connect Discovery and Metadata? Auto-configuration and Key Retrieval
Explains the role of the OpenID Connect ID Token and how Discovery (OpenID Connect Discovery / RFC 8414 AS Metadata) enables auto-configuration and public key retrieval, including key rotation via jwks_uri.
What is OAuth 2.1? Changes from OAuth 2.0 and the Security BCP (RFC 9700)
An overview of the changes from OAuth 2.0 to 2.1 and the security measures shown by RFC 9700 Security BCP and RFC 6819 threat model. Covers mandatory PKCE, deprecation of the Implicit grant, Mix-Up defenses, and more.
Three Uses of a Public Key: Signing, Encryption, and Key Exchange
A public key has just three uses: signing, encryption, and key exchange. This article sorts real-world applications such as SSH public-key auth, WebAuthn, mTLS, private_key_jwt, code signing, and container signing into these three, and clarifies how they differ from shared-key schemes such as HMAC, with primary sources.
Everything About Digital Identity: Knowledge for Realizing a Secure and User-Centric Identity System
Everything About Digital Identity: Knowledge for Realizing a Secure and User-Centric Identity System
Introduction to Digital Identity: Essential Authentication, Authorization, and ID Management for Web Services
Introduction to Digital Identity: Essential Authentication, Authorization, and ID Management for Web Services
OAuth 2.0 Explained: Complete Guide to Flows, Tokens, and Implementation
Summary based on RFC 6749 (OAuth 2.0 Authorization Framework) and RFC 6750 (Bearer Token Usage).
A Comprehensive Introduction to OAuth: Principles and Practices for Implementing a Secure Authorization System
A Comprehensive Introduction to OAuth: Principles and Practices for Implementing a Secure Authorization System
A Book to Understand Attacks and Countermeasures on OAuth and OIDC (Redirect Attack Edition)
A Book to Understand Attacks and Countermeasures on OAuth and OIDC (Redirect Attack Edition)
A Tutorial Guide to Understanding OAuth2.0 Without Just Going Through the Motions!
A Tutorial Guide to Understanding OAuth2.0 Without Just Going Through the Motions!
Resources for Catching Up on OAuth2 and OIDC
Explore OAuth2, OIDC, JWT, and authentication standards through comprehensive specifications, books, and implementation guides.
A Book to Understand the Differences Between OAuth, OAuth Authentication, and OpenID Connect
A book to understand the differences between OAuth, OAuth Authentication, and OpenID Connect
Basics of Authentication and Authorization
Learn authentication and authorization fundamentals: identification, RBAC, ABAC, credential types, SSO, SAML 2.0, OAuth 2.0, and OpenID Connect with practical context.