“…Based upon their employed sensor type, they can be classified into various sensor types: (i) temperature [11,15], (ii) acceleration [12,8,9,2], (iii) location information [6,14], (iv) RF (Radio Frequency) signals [14,7,16], (v) audio [3,4,10,14], (vi) light [3,4,10], (vii) exhaust gas [11], (viii) humidity [11], and (ix) altitude [11]. Halevi et al proposed a secure proximity detection scheme for a NFC enabled mobile payment system [3,4].…”