什么是 SSL 证书？为什么地址栏会出现小锁？

SSL/TLS 证书是由受信任的证书颁发机构（CA）签发的数字凭证，用于在浏览器与服务器之间建立加密连接并验证网站身份。当证书验证通过后，浏览器地址栏就会显示 🔒 小锁和 https:// 前缀，代表「连接已加密、网站身份已核实」。

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什么是 SSL 证书？为什么地址栏会出现小锁？

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