this one box. Tis is normally done by the IT department of the company installing the PC. But architectures are changing and the sensors are becoming smart and full of programmable components. Tis means each sensor must be protected as should, normally, the connecting protocols.
Modern architecture with firewall Modern architectures often have smart sensors connected together in a network, with maybe several processing devices in the network. Tey often have a bi-directional connection to the cloud to send data and to receive software updates. All these individual sensors and processing devices can be hacked and have to be secured. With multiple devices, the chances of missing something goes up. In addition, the cloud connection has to be secure. Often the entire system is inside the
customer’s firewall. Many people see this as justification for not having to do anything about security for individual smart sensors, as these are all hidden behind the firewall.
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Tis is, of course, wrong. If the attacker
manages to get spyware inside the firewall on any device – for instance, by using an automatic update running over an unsecure server in the cloud – then suddenly the entire system is accessible. In February 2022, the US government released a Federal Strategy implementing a ‘zero trust’ network as a security measure to stop this line of attack. Te strategy states that all objects in the network must be secure in case the network firewall gets penetrated.
Building blocks of IoT security For security to be taken seriously, hardware, software and data must be considered together. Hardware needs a secure boot mechanism, a trusted platform module and, of course, where possible, physical security. Software through the secure boot launches into a secure OS, with a secure communication stack, closed ports and a firewall. Data stored on the device and in transit must be encrypted and securely hashed to
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