| 摘要 |
An Identity Management system in which a User may use a single set of credentials to log into multiple Web Service Providers differs from traditional systems in that none of the WSPs have to rely on assertions issued by an Identity Provider. The Identity Provider remains unaware of the User's credentials and the User's personal information. A three-way cryptographic protocol is employed between the User, the Web Service Provider and the Identity Provider that allows re-use of credentials without exposing the Identity Provider to any sensitive information. At the same time, the Identity Provider provides full set of Identity Management services to the User and to the Web Service Provider, without knowing the identities it is dealing with. In addition, the Identity Provider is deprived of an ability to manipulate the identity data in any way, thus ensuring the Web Service Provider is in full control over the relationship with its customer (the User).
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