OpenID 2.0

E700379

authentication protocol decentralized authentication protocol single sign-on protocol

OpenID 2.0 is an earlier decentralized authentication protocol that allowed users to sign into multiple websites using a single identity URL, later superseded by OpenID Connect.

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All labels observed (3)

Label	Occurrences
OpenID 2.0 canonical	2
OpenID	1
OpenID Authentication 2.0 specification	1

How this entity was disambiguated

This entity first appeared as the object of triple T7934245 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: OpenID 2.0
Context triple: [OpenID Connect, replaces, OpenID 2.0]

A. OpenID Connect
OpenID Connect is an identity layer built on top of OAuth 2.0 that enables secure user authentication and single sign-on across applications.
B. SAML
SAML (Security Assertion Markup Language) is an XML-based open standard for exchanging authentication and authorization data between identity providers and service providers, commonly used for single sign-on (SSO) in web applications.
C. OAuth 2.0
OAuth 2.0 is an industry-standard authorization framework that enables applications to obtain limited access to user resources on HTTP services without exposing user credentials.
D. RFC 6749
RFC 6749 is the IETF specification that defines the OAuth 2.0 authorization framework used for secure delegated access to web resources.
E. OAuth 1.0
OAuth 1.0 is an older open standard authorization protocol that enabled secure delegated access to web resources without sharing user credentials, and has since been superseded by OAuth 2.0.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: OpenID 2.0
Target entity description: OpenID 2.0 is an earlier decentralized authentication protocol that allowed users to sign into multiple websites using a single identity URL, later superseded by OpenID Connect.

A. OpenID Connect
OpenID Connect is an identity layer built on top of OAuth 2.0 that enables secure user authentication and single sign-on across applications.
B. SAML
SAML (Security Assertion Markup Language) is an XML-based open standard for exchanging authentication and authorization data between identity providers and service providers, commonly used for single sign-on (SSO) in web applications.
C. OAuth 2.0
OAuth 2.0 is an industry-standard authorization framework that enables applications to obtain limited access to user resources on HTTP services without exposing user credentials.
D. RFC 5849
RFC 5849 is the Internet standard that originally defined the OAuth 1.0 protocol for secure delegated authorization before being superseded by OAuth 2.0 in RFC 6749.
E. RFC 6749
RFC 6749 is the IETF specification that defines the OAuth 2.0 authorization framework used for secure delegated access to web resources.
F. None of above. chosen

Statements (46)

Predicate	Object
instanceOf	authentication protocol ⓘ decentralized authentication protocol ⓘ single sign-on protocol ⓘ
authenticationModel	browser-based authentication ⓘ redirect-based authentication ⓘ
category	federated identity protocol ⓘ web authentication standard ⓘ
component	end user ⓘ identity provider ⓘ relying party ⓘ
defines	OpenID authentication request ⓘ OpenID authentication response ⓘ Simple Registration (SReg) extension ⓘ association between relying party and identity provider ⓘ attribute exchange extensions ⓘ discovery process for user identifiers ⓘ
designGoal	decentralization ⓘ interoperability between identity providers and relying parties ⓘ user-controlled identity ⓘ
developer	OpenID Foundation ⓘ
follows	OpenID 1.0 ⓘ
governedBy	OpenID Foundation policies ⓘ linked to: OpenID Foundation
identifierType	OP-Local identifier ⓘ claimed identifier ⓘ
interoperatesWith	multiple independent identity providers ⓘ multiple relying party websites ⓘ
partOf	OpenID family of protocols ⓘ
role	allows users to authenticate using a single identity URL ⓘ delegates authentication to an identity provider ⓘ enables single sign-on across multiple websites ⓘ
securityProperty	does not natively define OAuth-style authorization ⓘ primarily designed for authentication, not API access ⓘ
standardizedIn	OpenID Authentication 2.0 specification ⓘ linked to: OpenID 2.0
status	superseded ⓘ
successor	OpenID Connect 1.0 ⓘ linked to: OpenID Connect
supersededBy	OpenID Connect ⓘ
supports	XRI identifiers ⓘ identity URLs ⓘ
supportsExtension	Attribute Exchange (AX) ⓘ Simple Registration (SReg) ⓘ linked to: Simple Registration (SReg) extension
transportBinding	HTML form POST ⓘ HTTP redirect ⓘ
uses	HTTP ⓘ URL identifiers ⓘ XRDS discovery ⓘ Yadis discovery ⓘ

How these facts were elicited

Referenced by (4)

Full triples — surface form annotated when it differs from this entity's canonical label.

OpenID Connect → replaces → OpenID 2.0 ⓘ

OpenID Foundation → standardDeveloped → OpenID ⓘ

linked to: OpenID 2.0

OpenID Foundation → standardDeveloped → OpenID 2.0 ⓘ

OpenID 2.0 → standardizedIn → OpenID Authentication 2.0 specification ⓘ