Serious question: does anyone here know specifically what data is transmitted such that the filter authenticates correctly to the refrigerator? Guessing it can

Serious question: does anyone here know specifically what data is transmitted such that the filter authenticates correctly to the refrigerator? Guessing it can't some kind of challenge-response (no processing element on filter)? I know a little bit about RFID and know a decent amount about DRM in general, but I'm specifically wondering what type of cryptography (presumably?) is used here. I've got to imagine the RFID tag provides some kind of signed data (e.g. serial number) that can be verified by the fridge's "Führer board" (poster's term, not mine). BTW this kind of stuff is everywhere, not just water filters and Keurig coffee. IMO sometimes perhaps it's justified for safety reasons (consumable parts of medical devices, laptop batteries[fires], etc.). Not so much maybe for inkjet/laser printer cartridges, coffee refills, etc. Side note: I consulted with a printer company maybe 5-6 years ago, and they pretty much convinced me (brainwashed me?) that their big concern wasn't revenue stream, but customer experience / damage to the printer. The one and only time I've owned an inkjet, I bought a cheap ink refill and it printed like shit and eventually ruptured and damaged the printer, so perhaps I was pre-disposed to believing the printer company.