Abstract: A card (35) generates a dynamic security code for a card transaction, e.g. a card not present (CNP) transaction. The card (35) receives a request (83) to generate a dynamic security code from an electronic device (10) external to the card via an external card interface (330). The card (35) receives a message (87) comprising a time via the external card interface (330). The card (35) computes (89) the dynamic security code based on the time and a key (dCVV-key) stored at the card. The card (35) sends the dynamic security code (90) to the electronic device (10) via the external card interface (330) for display on a display (14) of the electronic device (10). The card (35) may determine (88) an authenticity of the message comprising the time.

Abstract: Disclosed is a card that generates a dynamic security code for a card transaction, e.g. a card not present transaction. The card receives a request to generate a dynamic security code from an electronic device external to the card via an external card interface. The card receives a message including a time via the external card interface. The card computes the dynamic security code based on the time and a key stored at the card. The card sends the dynamic security code to the electronic device via the external card interface for display on a display of the electronic device. The card may determine an authenticity of the message including the time.