MULTI-APPLICATION MOBILE AUTHENTICATION DEVICE

摘要

The invention makes it possible to allow several applications to coexist in the same card; the implementation of the applications uses reading and writing of data by the reader in the same memory location. The invention is a method for exchanging data between a mobile authentication device 3 supporting several applications Z1 to Z3 and a reader dedicated to one application in which the reader sends an authentication command and at least one read and/or write command. The authentication command allows the mobile device to authorise a transaction for at least part of an application Z1 to Z3 supported by the said mobile device. In response to the authentication command, the mobile device selects the application of the device that corresponds to the reader. The read and/or write command is carried out by addressing a definite block of data. In response to the read and/or write command, the mobile device addresses the block of the selected application.