The digital certificate contains specific pieces of information about the identity of the certificateowner and about the certificate authority, including
数字证书包含关于证书所有者的身份以及认证机构的信息,包括
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Certificate: a public key with some information attached about the identity of its owner and, optionally, the signatures of third parties confirming this identity.
证书:附带了某些有关其所有者身份信息的公钥;可选地,该信息为确认此身份的第三方的签名。
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Workaround: There is no workaround if the site's certificate is expired; contact the site owner and request that they update the certificate.