With the increasing acceptance of digital certificates, there has been a gaining impetus for methods to nullify the compromised digital certificates and enable the end user to receive this information before he trusts a revoked certificate.

• 于是，随着证书应用范围的扩大，在终端用户使用证书之前撤销已经失效的证书并且使用户得到最新的证书状态信息变得越来越重要。