User’s identity could be the number of ID card, the e-mail address, the account number, the name and so on.
用户标识可以是身份证号码、电子邮件地址、帐户号码、姓名等。
参考来源 - 基于CPK的数字签名及其在电子邮件系统中的应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
N-COUNT An ID card is the same as an identity card, identification card. 同identity card或identification card
...a proposal to introduce ID cards.
...一项实行身份证的建议。
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