Database: the database performs both identification and authentication of users.

数据库：数据库执行对用户的识别和身份验证。

youdao

But in order to get verified, Weibo requires users to submit proof of identification.

但为了验证身份，微博也需要用户提交身份证明。

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You need to provide a mechanism to support user identification and authentication that allows for the unique identification of users.

需要提供一种机制以支持用户标识和身份验证，允许用户拥有惟一的身份标识。

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The fraudulent eBay site not only asks for users' eBay identification, password and email address but also credit card, bank account, drivers license and social security numbers.

BBC: eBay shadow site

But Mr Clayton said the recent row over search data released by AOL showed that identification of users could still be made even without a machine's unique IP address.

BBC: NEWS | Technology | Privacy bodies back Google step

Gox said Thursday it is beefing up its identification process for users.

WSJ: 'Virtual' Currencies Draw State Scrutiny