该信息以证书的形式出现，由通常叫证书认证机构（CA）的第三方批准的。
The information comes in the form of a certificate, which is counter-signed by third parties known as certificate authorities (CAs).
数字证书一般是由名为认证中心(Certification Authority, ca)的可信的第三方签发的。
The digital certificate is typically issued by a trusted third party called a Certification Authority (ca). For a fee, the ca will generate a digital certificate that contains.
PKI利用可信的第三方认证机构（CA）签发的数字证书在网络通信中建立和管理信任。
With the digital certification enacted by CA, Public Key Infrastructure (PKI) provides a framework to construct and manage the trust relationship.
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