Device, system and method for reducing an interaction time for a contactless transaction

A system comprising:

• a reader comprising:
• a contactless interface;
• a transaction module coupled to the contactless interface and configured to:
• wirelessly send from the reader to a card in a command message a terminal unpredictable number, transaction amount, and transaction currency;
• receive from the card in response to the command message a wireless message with a dynamic signature based on an application transaction counter (ATC), the terminal unpredictable number, the transaction amount, the transaction currency, and a card unpredictable number, the dynamic signature sent with an application file locator (AFL);
• and then
• wirelessly transmit from the reader to the card a read record command message to request one or more records indicated in the AFL from the card;
• and
• receive from the card the requested one or more records requested by the read record command;
• and
• a security module, coupled to the transaction module, configured for:
• recalculating the dynamic signature;
• and
• authorizing the contactless transaction if the dynamic signature received from the card is validated;
• and
• a card configured to:
• send from the card to the reader the wireless message with the dynamic signature;
• and then
• send from the card to the reader the requested one or more records requested by the read record command,
• wherein the transaction module is configured to minimize an interaction time under 500 milliseconds for a contactless transaction between the reader and the card.

A method for minimizing an interaction time under 500 milliseconds for a contactless transaction between a reader and a card, the method comprising:

• wirelessly sending from a reader to a card in a command message a terminal unpredictable number, transaction amount, and transaction currency;
• receiving at the reader from the card in response to the command message a wireless message with a dynamic signature generated based on an application transaction counter (ATC), the terminal unpredictable number, the transaction amount, the transaction currency, and a card unpredictable number, the dynamic signature sent with an application file locator (AFL);
• and then
• wirelessly transmitting from the reader to the card a read record command message to request one or more records indicated in the AFL from the card;
• and
• receiving at the reader from the card the requested one or more records requested by the read record command;
• and
• recalculating the dynamic signature based on the application transaction counter, the terminal unpredictable number, transaction amount, and transaction currency;
• and
• authorizing the contactless transaction if the dynamic signature received from card by the reader is validated.