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Mobile wallets promise to allow people to easily manage their accounts and to carry less cards. However, the slow adoption of contactless point of sales (POS) terminals by merchants limits the potential of Near-Field Communication (NFC) based payment devices. In this paper, we discuss Wild Card, a secure and backward compatible way to make mobile payment through conventional magnetic stripe based POS terminals. The device resembles a traditional credit card in its physical dimensions and staysdoi:10.1109/percom.2014.6813952 dblp:conf/percom/SalajeghehPL14 fatcat:u2scbvdqobc4hnmtufugx54n6a