Sometimes I forget my RFID door access card at home when I go to work, and when this happens I must stay in the building for the rest of the day or have a friend let me in if I leave during the day (i.e. to go to lunch).
My Galaxy S4 phone has NFC capability. Is it possible to record my RFID door access card to my phone so I can use my phone in lieu of my card for times when I forget my card?
I have not found any apps which will do this, so I am wondering if the phone is even capable of performing this function.
33 Answers
Assuming the RFID system you are talking about only expects a key, and then does a look up in the user db.
Usually, a new UID is generated for each NFC transaction by phones. Some users have been able to maintain a static UID sent from the phone to the RFID receiver. A static UID will then act to send a constant "key" across to the RFID receiver instead of a generated one, everytime you try to swipe the device.
To obtain the static UID, you need to change the firmware on your phone, to only send one UID. Users on this forum have achieved it on the Google Nexus S and EVO 4g LTE.
Happy days!
1You can melt the card with acetone, which will get you the chip and antenna. You could then stick them inside your phone cover and use it as an RFID card.
2It depends on your access-control system. Normally, the UID of the card is not used in access control, but rather encrypted information on the card. Therefore, it is not possible to clone/record your RFID card.
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