Patent ID: 7798394

Claim:
A reader, comprising: a contactless interface; a transaction module coupled to the contactless interface, wherein: the transaction module is structured and arranged to: discover the presence of a contactless payment device within a predetermined distance from the reader; energize the contactless interface upon discovery of the presence of the contactless payment device within the predetermined distance from the reader, wherein the energized contactless interface enables communication between the contactless payment device and the reader; send to the contactless payment device, via the contactless interface, a request for data; and receive, from the contactless payment device, via the contactless interface, the requested data; perform: a contactless transaction with less than one-half second of interaction time between the contactless payment device and the reader; and static and dynamic data authentication using the requested data; and a security module coupled to the transaction module, wherein the security module is structured and arranged to prevent a man in the middle attack on the contactless transaction by validating a dynamic signature received from the contactless payment device, wherein the dynamic signature comprises: a transaction currency code; and a contactless payment device unpredictable number.