当无法使用安全凭据来创建一个新的标识时。
When the secure credentials are not available to create a new identity.
需要从各种平台访问相同的服务，要求它能接受和验证安全凭据，并要足够简单，以便开发人员进行构建和客户进行使用。
The same service needs to be accessible from diverse platforms, to accept and validate security credentials, and be simple enough for developers to build and for clients to consume.
使用Web服务通信的应用程序可以使用WS - Trust获得和交换安全凭据。
Applications that communicate using Web services can use WS-Trust to obtain and exchange security credentials.
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