in hotels, if you lose your room key card, how are they able to reprogram the new one so it works and the old one doesn’t?

Question

Is there some system that transmits information to your door card reader on what the new key is, or is it something different entirely?

In: 1028

Answer 1

I don’t know if this is the answer but this problem isn’t really the issues you seen to think it is. They wouldn’t have to change to code on the card, all they would have to do is change the code that the door requires.

So say your card has a coffee of 21 and that’s the code that will open the door, for that to happen you have to also give the door to expect code 21 for it to open, but now you lost your card, but you can’t change the code on the card because you don’t have the card to change it, so instead you just tell the door to expect code 22 and then open. So now if someone finds the lost card their won’t be a door that expects code 21 to open.

But then you also have the possibility to make the card change its code the moment it interacts with the system