In the DSS structure, the most important part is implementation of the personal firewall.
We use an embedded system to implement this part.
There are a number of benefits by using the embedded system. The embedded system has its own control processor unit and memory.
It also has the network and USB interfaces.
Therefore, we can build the firewall module on the embedded system by connecting the embedded system to the computer by USB interface and connecting the embedded system to the Internet by Network interface at the same time.
We use the embedded system as a Network Interface Card (NIC).