IoT security: the security appliance approach
Security appliances also play a central role in protecting IoT networks from cyber attacks. IoT network architectures are diverse and include a range of devices and computing resources. Not surprisingly, there are equally diverse sets of security appliances for IoT networks. Most of these approaches fall into three main categories; protecting the network and cloud, IoT-specific intrusion detection, and protecting legacy devices.
Network and cloud protection
As with traditional IT networks, security appliances provide a critical layer of defence at the network perimeter and for the data centre. The frequency and sophistication of cyber attacks targeting data centres and cloud-based computing resources continues to increase and many new IoT services and connections open up fresh attack vectors for hackers targeting these systems. Network security appliances must not only be deployed to protect these devices, but must also be constantly updated to secure new IoT protocols and services.
Intrusion detection systems (IDS) for IoT networks
The deployment of new protocols and services to meet IoT requirements results in new attack vectors hackers can exploit. Companies are developing new network IDS solutions to detect attacks against newer services and protocols.
In some cases, existing network IDS solutions can be enhanced to detect new attacks. These solutions work well for detecting attacks occurring at the network edge or data centre, where existing network IDS solutions are deployed.
For mobile or remotely deployed IoT devices, however, these solutions add little value. New types of IDS solutions are required to detect attacks targeting remote IoT endpoints.
There are several challenges to detecting attacks targeting IoT endpoints in the field. The IDS appliance itself must be designed to operate in the same location as the IoT endpoints. In many cases, this requires physical hardening of the device, allowing operation in harsh environments.
The IDS appliance must detect new attacks, many of which are emerging or will emerge in the coming years. They must also support IoT new protocols. Any appliance designed today must be flexible enough to provide protection against new attacks as they emerge.
Finally, economic factors must be taken into considerations. The physical footprint of an IoT network may require deployment of a large number of IDS appliances. Unfortunately, the cost model of many solutions makes them prohibitive for this model.