数字证书的有效期到期怎么办？
What shall be done if the validity of digital certificate expires?
其他证书的有效期为4年。
颁发的客户端证书的有效期通常是一年，不过，CA对有效期可能有自己的规定。
Client certificates are typically issued with a validity period of one year, however, the ca may have its own constraints on the validity period.
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