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Fortune cookies and smartphones: Weakly unrelayable channels to counter relay attacks

2014; Elsevier BV; Volume: 20; Linguagem: Inglês

10.1016/j.pmcj.2014.09.002

1873-1589

Mario Čagalj, Toni Perković, Marin Bugarić, Shujun Li,

Wireless Networks and Protocols

Smartphones are being increasingly used to perform financial transactions (through m-banking, virtual wallet or as a smartcard).The latter applications involve contactless technology (e.g., NFC) that is known to be vulnerable to mafia fraud attacks.In this work we show that a secret message inside an appropriately folded piece of paper (fortune cookie) can be used to effectively mitigate the mafia fraud attack.Fortune cookies implement a weakly unrelayable channel that, in combination with smartphones, provides a provable protection against those attacks.Our solution requires minimal or no hardware changes to the existing equipment (especially on the user's side) and is suitable for different communication technologies (e.g., intra-body