 In September 2012 a security consultancy Intrepidus demonstrated at the EU SecWest event in Amsterdam, that MIFARE Ultralight product-based fare cards in the New Jersey and San Francisco transit systems can be manipulated using an Android application, enabling travelers to reset their card balance and travel for free in a talk entitled "NFC For Free Rides and Rooms (on your phone)".Although not a direct attack on the chip but rather the reloading of an unprotected register on the device, it allows hackers to replace value and show that the card is valid for use.This can be overcome by having a copy of the register online so that values can be analysed and suspect cards hot-listed.