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基于SAML的单点登录介绍
SAML2.0 协议初识(一)
A Service Provider (SP) is an entity that provides Web Services. ... In the WS-Federation model a Service Provider is called a “Relying Party” (RP).
In SAML, the XML-standard for exchanging data, the security domains that information is passed between are a Service Provider (SP) and an Identity Provider (IdP).