When a user visits such sites, they are relying upon certificate Authorities (CAs), hundreds of companies that sign the certificates that supposedly guarantee secure browsing.
当用户访问这样的网址，他们依赖认证权威(CA)，这是数百个公司签署的证书来保证安全浏览。
The information comes in the form of a certificate, which is counter-signed by third parties known as certificate authorities (CAs).
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。
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