NFC tag to activate home alarm

Hi, I have just purchased few NFC tags and thinking to use them to activate and de-activate my home alarm and I have some doubts.

If someone has the access to the tag and scan it, will it de-activate my home alarm? Presume he doesn’t have the access to my HA instance.

No. Only tag scans sent to home assistant can trigger automations to arm/disarm your alarm.

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Got it. Thanks

But if someone copies the tag then they can, if they know where you live and have a spare key, disarm the alarm.

Not the way Yeoh seems to be planning on implementing this. Sounds like he will have a tag somewhere that he scans with his phone to arm/disarm the alarm.

As the would-be thief only has access to the tag and not the phone there is no way to trigger the arm/disarm automation.

True. Didn’t realize it was the app.
I thought of a scanner mounted inside the home.