A method for controlling a near field communication between a device and a transaction card is disclosed. The method includes the steps of capturing, by a front-facing camera of the device, a series of images of the transaction card and processing each image of the series of images to identify a darkness level associated with a distance of the transaction card from the front of the device. The method includes comparing each identified darkness level to a predetermined darkness level associated with a preferred distance for a near field communication read operation and automatically triggering a near field communication read operation between the device and the transaction card for the communication of a cryptogram from an applet of the transaction card to the device in response to the identified darkness level corresponding to the predetermined darkness level associated with the preferred distance for the near field communication read operation.

A method is provided for differentiating one of a plurality of unpowered NFC transmitting devices for NFC communication with a receiving device. Each NFC transmitting device has a transmitter NFC interface and an NFC communication range. A range extending device has a power source, a transmitter communication interface, a range extender antenna, and an amplifier. One of the transmitting devices is selected and the range extending device is connected to it so that the transmitter communication interface engages the transmitter NFC interface of the selected transmitting device. This action serves to establish an extended communication range for the selected NFC transmitting device. The NFC transmitting devices are then positioned at a distance from the receiving device that is within the extended communication range, but outside the communication ranges of the other NFC transmitting devices. NFC communication is then established between the selected NFC transmitting device and the receiving device.

Embodiments may be generally directed to methods, techniques and devices to utilize a contactless card to perform a series of operations.

Systems, methods, articles of manufacture, and computer-readable media. A web browser of a device may receive selection of a uniform resource locator (URL). An operating system may download an application from an application server based on the URL. The application may identify a plurality of applications installed on the device and select a first institution corresponding to a first application. The application may receive a cryptogram from a contactless card associated with the first institution and transmit the cryptogram to an authentication server. The application may receive an authentication result specifying the authentication server decrypted the cryptogram. The web browser may receive, based on the decryption of the cryptogram, an account number, an expiration date associated with the account number, and a card verification value (CVV) associated with the account number. The web browser may provide the account number, expiration date, and CVV to a server associated with the application.

A dynamic transaction card including: one or more light emitting elements; a transceiver; and an embedded microprocessor configured to: receive, from a transaction terminal, a location information corresponding to a current location of the transaction terminal; wirelessly transmit, via the transceiver and to a mobile device, the location information; receive an indication that a location-specific security concern exists; and in response to receiving the indication, control the one or more light emitting elements to display a visual indication corresponding to the location-specific security concern.

Provided are a payment method and system through generation of a one-time payment-only number of a real card linked with an application, wherein in order to make payment safely by generating a one-time payment-only number every payment without leaving card information of a user in a provider's payment terminal or by using the generated one-time payment-only number, when a real card is linked with an application installed on a user terminal and the payment terminal recognizes the real card, a user signature input window, and transaction information about payment performed with a one-time payment-only number generated by a card company server are displayed on a screen of the application of the user terminal, and payment is performed when a signature of the user is input to the signature input window.

A system includes a processor and a non-transitory computer readable medium coupled to the processor. The non-transitory computer readable medium includes code, that when executed by the processor, causes the processor to receive input from a user of a user device to generate an optimal payment location on an application display, generate a first boundary of the optimal payment location on the application display of the user device based upon a first motion of a payment enabled card in a first direction and generate a second boundary of the optimal payment location on the application display of the user device based upon a second motion of the payment enabled card in a second direction. The first boundary and the second boundary combine to form defining edges of the optimal payment location.

Methods and apparatus for enabling a proximity payment device to generate dynamic data for securely conducting a transaction by emulating a magnetic stripe payment card. In an embodiment, a mobile device processor transmits information to a digital enablement service computer to activate a simulated magnetic stripe payment wallet application stored in the mobile device. The mobile device then receives one or more cryptographic keys, generates an unpredictable number (UN), generates dynamic CVC3 data based on the UN, and then assembles emulated magnetic stripe data. During initiation of a purchase transaction, the mobile device processor transmits the emulated magnetic stripe data to a communications interface associated with a merchant device.

A method for processing a transaction of a communications terminal, asking a server, through a communications network, for processing of a transaction involving the use of payment data. The method is implemented within the communications terminal. The method includes: transmitting a request for obtaining a certification code to the payment method whose data is used for the transaction; receiving the certification code coming from the payment method; inserting the certification code into a transaction data structure; transmitting the transaction data structure to the server; and when the certification code received by the server is valid, receiving a piece of data representing the validation of the transaction by the server.

Set of two or more dongles for providing a digital signature, wherein each dongle holds a secret key, wherein each dongle is configured to receive a message, to compute a digital signature of the received message using the secret key, and to transmit the computed digital signature, wherein at least one of the dongles is configured to, before computing the digital signature, verify the presence of at least one other dongle belonging to the set, and to compute the digital signature only upon successful verification of the presence of one or more other dongles.