身份认证的英文：
ID authentication
identity authentication

authentication是什么意思：
n. 证明；鉴定

authentically ad.
确实地；真正地

Being authentically or genuinely such by birth.
纯种的出身纯正或血统纯净的

To substantiate or authenticate with evidence.
证实用证据证明为真

One that is not authentic or genuine; a sham.
冒牌货假的或冒充的人、物；赝品

In term of law, they is equally authentic.
就法律条款而言，它们具有同等的效力。

identity是什么意思：
n. 身份；同一性；一致；特性；个性；恒等式

Your appearance is identical to hers.
你的相貌和她的一模一样。

They're wearing identical clothes.
他们穿着完全相同的衣服。

The police have no clue to his identity.
警察没有可以确定他的身份的任何线索。

We reach an identity of views.
我们取得完全一致的看法。

These two designs are almost identical.
这两种式样几乎完全相同。