Patent ID: 8342415

Claim:
A method of conducting a transaction between a Near Field Communication (NFC) device and a passive contactless integrated circuit, the NFC device comprising an NFC controller coupled to a contactless communication interface, and at least a first host processor comprising at least one card application program, the method comprising: providing, in an intermediary unit, a first protocol inversion program, wherein the intermediary unit of the NFC device: sets the contactless communication interface in an active mode wherein the interface emits a magnetic field and establishes a communication with the contactless integrated circuit, receives, from the contactless integrated circuit, first reader application commands and transferring the first reader application commands to the first host processor, and receives, from the first host processor, first card application responses and transferring the first card application responses to the contactless integrated circuit; providing, in the contactless integrated circuit, at least one reader application emulation program configured to supply first reader application commands and to treat first card application responses; and providing, in the contactless integrated circuit, a second protocol inversion program configured to cooperate with the reader application emulation program; establishing, between the first and the second inversion programs, a contactless communication wherein the intermediary unit acts as a reader relative to the contactless integrated circuit; and by an intermediary of the second and the first inversion programs: transferring to the first host processor, first reader application commands supplied by the reader application emulation program, and transferring to the reader application emulation program, first card application responses supplied by the card application of the first host processor.