[Waterluvian]

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.

[netsharc]

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...

[newaccount74]

Blocking radio signals is harder than just adding some aluminium. I'm pretty sure most "RFID blocking" wallets don't actually block RFID reliably.

[Waterluvian]

I’ve seen error messages. But usually my Mastercard wins. I think it might just be faster to electrify.

[HellzStormer]

The analogy isn't the same, the lock could copy the actual key to make a replica in the future.

ssh is only flashing the "name" printed on each key and asking if it should try one of them. (not exactly but it's more equivalent)

[quickthrower2]

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

[Arbortheus]

That’s very trusting that there isn’t some race condition on the POS that ends up charging them all.

[Waterluvian]

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.

[xwdv]

We’ll know we’re in the future when the payment gets split evenly amongst all participants. It’s like paying down a bill with the power of friendship.