A security mechanism to increase confidence in m-transactions

Currently, NFC phones are coming in the handheld market, providing facilities to perform m-transactions. Obviously, this type of operation requires special security precautions. Indeed, a malicious code could intercept and hijack the system, even if there is a smart card. For example, the amount of the payment displayed in the terminal can be hijacked by an attacker to fool the user, or user´s credential can be stolen thanks to a keylogger (and thus malicious codes can perform unwanted m-transactions automatically). This paper describes a security mechanism based on a graphical Turing test to prevent m-transactions submission by malwares. Firstly it introduces current m-transactions solutions. Then it explains the security mechanism that we propose to tackle the problem of untrusted handheld devices. It also underlines a proof of concept we implemented, to test its feasibility on a SIM card. Finally, it gives information on performances corresponding to the implementation that we made.