To demonstrate the speed of the relay app we developed, we relayed the signals from a bank card from New York to a payment terminal in Birmingham, as shown in the video above (the card in the video has now been cancelled). The protocol changes we suggest in our paper will make successfully relaying the card signals using a mobile phone impossible over any distance.

We also demonstrated the relay live on stage at the Financial Cryptography Conference 2015 in Puerto Rico by relaying the card signals to Birmingham. The traces (including timing information) of both of these relay sessions are available below:

• A trace from our relay when relaying a of an Co-op Visa payWave card between New York and Birmingham UK.
• A trace from our relay, when relaying a of an Co-op Visa payWave card between Puerto Rico and Birmingham UK.