RFID Phones unlock doors
Hayakawa Realty starts selling new condos whose doors can be opened by RFID-powered mobile phones.
It is similar to using RFID cards to open doors but there is a fundamental difference because RFID tags embedded in mobile phones can easily be connected to the network. Keys can be digitally copied over the network. Also, one could issue a temporary key that expires after a specified period of time.
Via ITMeida News, July 21. (in Japanese)