The Belgian French television made a story [in French] about this problem. The journalist interviewed the STIB spokeman. During the interview, he said:
â€œIl y a des donnÃ©es qui peuvent apparaÃ®tre en clair, Ã condition dâ€™avoir les logiciels et le matÃ©riel appropriÃ©, mais ce nâ€™est pas en clair, il faut avoir un terrible matÃ©riel.â€ [Translation: “Using appropriate software and hardware, there are data that may appear not encrypted. But it’s not the case, your must use a strong infrastructure to read them.“]
This is a good example of security by obscurity. There is a real risk is to see geeks performing war-driving with RFID readers like they started to do a few years ago to find unsecured Wi-Fi access points. Only the encryption of data stored on the RFID chip could solve this issue!