DB 2恢复命令调用DB2包含在数据库备份映像中的代理，然后DB 2代理通过与安全服务器通信对其进行解密。
The DB2 restore command invokes the DB2 agent contained in the database backup image, and the DB2 agent decrypts it by communicating with the security server.
该方法实现简单，但存在缺陷：由于附加块信息不同于正常通信过程，恶意用户容易察觉通信具有密钥恢复功能，使用数据包过滤方法，就可以完全屏蔽密钥恢复功能。
The implementation is practical but with obvious disadvantage: the illegal user can easily notice the key recovery, and by data package filtering, the key recovery function can be screened.
对于由链路出错所引起的数据包丢失，可以明显加快发送窗口的恢复速度，从而大大提高卫星链路中tcp的吞吐量。
For the packet loss caused by the link error, it can recover the congestion Windows quickly, so the goodput of TCP in satellite net can be improved.
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