DigestValue的签名是将资源内容与签名者金钥系结的机制。
The signing of the DigestValue is the mechanism that binds a resource's content to the signer's key.
衍生金钥的来源是“安全对话”，其中会有共用的安全性内容，可让相同的安全性套用在对话中的所有讯息。
Derived keys originate in Secure Conversations where there is a Shared security context so that the same security can be applied across all messages in the conversation.
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