Abstract: A system, apparatus and a method to connect at least two items of equipment, a first item of equipment having a first confidentiality level and a second item of equipment having a second confidentiality level, the two items of equipment in communication with equipment external to the system through the use of a protocol wherein the system includes at least: a medium allowing the transmission of data between the first and second items of equipment; an interface between the medium and the first item of equipment; an interface between the medium and the second item of equipment; first module to allow a first monodirectional adaptation of the protocol and to allow the transmission of data monodirectionally; and a second module to allow a second monodirectional adaptation of the protocol and to allow a reception of the data monodirectionally from the first module.

Abstract: A system and method for marking and controlling the transfer of information between several users (2i, 9i). An authority (3) marks information to be transmitted. A directory (4) or device containing the certificates of all users as well as the certificates of all the components of the architecture. A security office (5) is used to, a key management device (6a) and a privilege management device (6b).

Abstract: In a method of reducing the remanence of data stored in the memory space of a recording medium, in which at least a portion of the data stored in the memory space is moved in blocks according to a cycle repeated over time, the cycle includes choosing a number N of data blocks to be moved, and, as long as the number D of blocks moved during the cycle is less than N: a data block Bi to be moved is chosen, a free memory area is chosen; and the data block Bi is moved to this free area.

Abstract: A system, apparatus and a method to connect at least two items of equipment, a first item of equipment having a first confidentiality level and a second item of equipment having a second confidentiality level, the two items of equipment in communication with equipment external to the system through the use of a protocol wherein the system includes at least: a medium allowing the transmission of data between the first and second items of equipment; an interface between the medium and the first item of equipment; an interface between the medium and the second item of equipment; first module to allow a first monodirectional adaptation of the protocol and to allow the transmission of data monodirectionally; and a second module to allow a second monodirectional adaptation of the protocol and to allow a reception of the data monodirectionally from the first module.

Abstract: A system and method for marking and controlling the transfer of information between several users (2i, 9i). An authority (3) marks information to be transmitted. A directory (4) or device containing the certificates of all users as well as the certificates of all the components of the architecture. A security office (5) is used to, a key management device (6a) and a privilege management device (6b).

Abstract: A secured one-way interconnection system comprises at least one system A with a security level NA and one system B with a security level NB, the two systems exchanging information through a physical linking means, wherein the physical linking means is equipped with an optical isolator device adapted to transmitting information from the system with the security level NA to the system with the security level NB.