Abstract: Process for reclaiming storage spaces in a microcircuit card when they are no longer used by the references of the system. Each storage space (EM1-EM4) is provided with a header (E1-E4) containing a number of references representative at any moment of a plurality of references requesting the data of the corresponding storage space. The headers form the object of chaining (Ch) and a storage space the number of references of which has been reduced to zero can be re-allocated. Under certain conditions, available and adjacent storage spaces can be merged.

Abstract: A method of manufacturing a microcircuit board with a mechanical cut-out piece between the microcircuit and the board to limit stresses transmitted to the microcircuit. A blank of a network of conductors is created and the microcircuit is fixed in a container formed by shaping the blank, the microcircuit keeping the different parts of the network in position relative to each other and the module thus formed is installed in a cavity in the board by fixing the external connection areas onto the upper surface of the cavity.

Abstract: In a first step, electrical conductor tracks (15 to 20) are applied against the bottom and the walls of a cavity (5) for the integrated circuit (IC4) and connected to external contact pads (2) at the same side of the card. Said tracks lie alternately side-by-side at the bottom 7 of the cavity. In a second step, the IC (4) is glued with its surface which does not carry the contacts on said tracks on the bottom (7) of the cavity by means of a non-conducting glue. Then connections are realized by soldering of conductor wires (12) between contacts of the IC and ends of the tracks, and the cavity is filled with a protective resin. Application: Placement of an IC with inverted contacts in an electronic card support.

Abstract: The procedure involves key numbers "d" and "e" and a modulus N, so hat "N" is the product of two factors "p" and "q" which are prime numbers N=p.q, and e.d=1.sub.MOD.phi.(N), where .phi.(N) is the Euler indicator function. The procedure provides enciphered message parts and for deciphering them comprises: a modulus-determining step for determining a deciphering modulus chosen from "p" and "q", a modular reduction step for making a first modular reduction of the number "d" with a modulus equal to said deciphering modulus "(p-1),(q-1)" with the aim of producing a reduced number, a reduction step for making a second modular reduction of each enciphered message part with a modulus equal to said deciphering modulus with the aim of producing a reduced enciphered message part, an exponentiation step for computing a modular exponentiation of each reduced enciphered message part with a modulus equal to said deciphering modulus and with an exponent equal to said reduced number with the aim of restoring said message.