SSL/TLS证书为采用分层服务方案和价格的企业，提供数据安全、网络加密和身份验证等服务。随着互联网通讯和文件传输需要更高级别的加密，免费的SSL/TLS证书变得越来越普及，并易于安装和使用。价格更昂贵的SSL/TLS证书将在浏览器中以“绿色条”的形式展示，并显示公司的名称，而不再仅仅是地址栏中的“锁定”符号。
以前SSL/TLS证书需要每个域名匹配唯一的IP地址，但通配符证书是例外。免费的SSL/TLS证书不需要专门的IP地址进行操作。许多网络主机商以各种价格从注册服务商转售SSL/TLS证书，并允许从任何具有域名的来源都可以安装SSL/TLS证书。通配符证书可以和SSL/TLS证书一起使用，而大部分的其他SSL/TLS证书仅适用于单个域名或注册的子域名地址。
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