此外，拥有长寿命的证书让升级应用程序更为容易。
Also, having long-lived certificates makes your life easy when upgrading your applications.
这样，解密应用程序就不需要转换证书和私钥。
In this case the decrypting application needs no conversion for the certificate and private key.
如果应用程序使用数字证书来对客户进行身份验证，那么请使用CLIENT - CERT。
CLIENT-CERT is used if the application USES digital certificates for client authentication.
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