Connecting a device to the internet means you've created another potential entry point into your system.
So security can't be an afterthought.
At minimum, I'd want to think about:
Identity
Which device is this?
Authentication
Is it actually allowed to connect?
Encryption
Can someone intercept the data?
Authorization
What is this particular device allowed to do?
Updates
Can the device receive security patches?
Monitoring
Can we detect strange behavior?
The last one is easy to overlook.
A device might be authenticated correctly but suddenly start behaving very differently from normal.
That's still worth investigating.
And because IoT devices can remain deployed for years, security needs to be considered over the entire device lifecycle.
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