The idea of walking up to a lock and saying “here are all of my keys. Do any unlock you?” is kind of weird and backwards.
But I realize, thinking about it, I was doing that all the time at a previous job where I’d just mash my entire wallet against the keycard reader.
Bonus tangent: join me in playing “Payment Roulette” where you mash your wallet against payment terminals and let your credit and debit cards sort out which is going to pay.
A lot of times the machine would say "Use one card only", won't it? I have a Secrid wallet and I was expecting the aluminium to block the RFID reader except for the 1 card I put in the outer leather pocket, but I still need to open the wallet up and present the dangling card in its sleeve to stop multiple signals...
Not quite because there is no public/private key analogy. With a physical key there isn’t much security and you are relying on the copying of the key (if someone takes a photo) not happening. There would need to be some sophistication and anyone that sophisticated wouldn’t need to burglarise you. And it is that fact you rely on for a key. It is almost like a credit card PIN
I’m pretty confident that POS transactions are idempotent. It’s an entire state machine that you’re working through, too, so I doubt it’s capable of performing multiple transactions during the middle of one transaction.
But I realize, thinking about it, I was doing that all the time at a previous job where I’d just mash my entire wallet against the keycard reader.
Bonus tangent: join me in playing “Payment Roulette” where you mash your wallet against payment terminals and let your credit and debit cards sort out which is going to pay.