PKI中撤销证书是通过维护一个证书撤销列表CRL来实现的。以下不会导致证书被撤销的是（ ）。
- A.密钥泄漏
- B.系统升级
- C.证书到期
- D.从属变更
正确答案及解析
正确答案
解析
本题考查PKI相关知识。
每个证书都有一个有效使用期限，有效使用期限的长短由CA的政策决定。有效使用期限到期的证书应当撤销。证书的公钥所对应的私钥泄露，或证书的持证人死亡，证书的持证人严重违反证书管理的规章制度等情况下也要撤销证书。故本题选B。
公钥基础设施（PKI）是一种遵循既定标准的密钥管理平台，它提供了一种系统化的、可扩展的、统一的、可控制的公钥分发方法。和证书的签发一样，证书的撤销也是一个复杂的过程。证书的撤销要经过申请、批准、撤销三个过程。
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