SSL证书采用公钥体制，即利用一对互相匹配的密钥对进行数据加密和解密。每个用户自己设定一把特定的、仅为本人所知的私有密钥（私钥），并用它进行解密和签名；同时设定一把公共密钥（公钥）并由本人公开，为一组用户所共享，用于加密和验证签名。
由于密钥仅为本人所有，可以产生其他人无法生成的加密文件，也就是形成了数字签名。
SSL证书是一个经证书授权中心（CA）数字签名的、包含公开密钥拥有者信息以及公开密钥的文件。最简单的证书包含一个公开密钥、名称以及证书授权中心的数字签名。数字证书还有一个重要的特征就是只在特定的时间段内有效。
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