Is there some system that transmits information to your door card reader on what the new key is, or is it something different entirely?
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I don’t know the actual technology behind it, but think of a manual key. If you lose a physical key, you can go and get a duplicate made. You can also change out your lock and get a totally new key made. It’s the same thing, just electronically. There is a button to deactivate any other keys, and there is a button to duplicate the keys. The “copy” of the key is saved electronically.
Working in the hotel business back in the 1980’s. We used a system called Ving. The way it was explained to us was that when a new key was presented to the lock, the new key also “described” what the next key would look like. When the next key came along it would be accepted by the lock and the new key would “describe” what the next key would look like and the lock would delete the old key so it wouldn’t work anymore. This negates the need for a lock to “remember” a list of future keys. The lock only has to keep track of two keys; the current one and the next one.
You can search for RFID and MIFARE.
And also the device in the door is connected to the local area network, in other words to the reception’s computer.
Basically first, they identify the card and they enter its id into the system, like “The card with id t56hr54y6tuuj is for this door. The previous id, gı565ujtu5u is no longer valid for that door”. And then the job is up to the device in the door, it connects to thr recepgion computer each time it reads an RFID card, compares the ids and decides tonoprn or not.
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
The card only has a serial number. It always has the same serial number, it never changes.
The door lock is only a reader. It reads the card number. Then it transmits that number to the hotel IT system.
When you check in, the front desk pulls a card (any card) from the pile and puts it on a reader. The system reads the card serial number and associates it with a particular room for a duration in a database.
When you walk up to the door, it reads that serial number, queries the database, and if the two match up, opens the door.
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