在签发证书前，认证中心对请求方进行适当的背景检查，以验证该请求方就是它自己所声称的请求方。

Before issuing a certificate, Certification Authorities run appropriate background checks on the requestor to verify that the requestor is who they say they are.

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有关 HTTP 认证技术的背景资料可参看 RFC-2617。

Some background on HTTP authentication techniques can be found in RFC-2617.

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在ASNT的概念中，II i级人员应具有必要的经历，教育背景和能为任何公司编制无损检测人员资格鉴定和认证规程。

Level III individual, by the ASNT concept, was expected to have the necessary experience, education, and background to establish the program for any company's nondestructive testing needs.

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