Which one isn't key core principles of security for IoT gateway?

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Understanding security properties of an IoT gateway means focusing on guarantees about data and trusted interactions, not on planning or management aspects. Strategy is about how you design and govern security programs, not a property of the data or the connection itself. It doesn’t describe a way the gateway protects information or verifies who’s talking to it, so it isn’t a security principle.

In contrast, confidentiality, integrity, and authentication are concrete security properties. Confidentiality ensures data isn’t readable by unauthorized parties, typically through encryption. Integrity makes sure data hasn’t been altered in transit or storage. Authentication verifies the identity of devices or users before granting access. These are specific guarantees the gateway should provide to protect the system and the data it handles.

So, strategy isn’t a security property, while the other terms describe essential security guarantees.