There are three key core principles of security - confidentiality, integrity and authentication. You will need to ensure that all communications between the gateway and devices are meeting each of the three principles while communication is happening in the internal and external networks.
It is also worth noting that the gateway is often the first to be attacked because of two reasons:
- It has a higher processing power, which it can use to run more intensive applications. More power means better software, but better software means more vulnerabilities for a hacker to exploit.
- Because of its location as an Edge device between the internet and the intranet, the gateway is the point of entry for any threat vector (as well as a system’s first line of defense).