数字证书： 数字证书是由受信任方即认证机构（CA）发布的电子 ID 卡，用于建立凭证。
Digital certificates: Digital certificates are electronic ID cards issued by trusted parties know as Certificate Authority (CA) that establish credentials.
然后，发行认证机构可以根据移动设备客户机提供的凭证发送肯定或否定认证断言。
The issuing authority can then send a positive or negative authentication assertion depending upon the credentials presented by the mobile device client.
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