Prior to the execution of a program contained in a second chip card inserted
in a terminal such as a mobile radio telephone terminal, in addition to a first
chip card containing data and connected to a telecommunication network to which
the terminal is linked, one of the cards is authenticated by the other, or the
two cards are authenticated mutually. This double authentication ensures the authenticity
of the program for its overall execution in the terminal and the origin of the
second card, distributed through conventional channels, for the network operator.
