Patent number 8509447 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "When considering the communication networks used by organizations that have to intervene in difficult environments such as the fire and rescue service, the civil defense service, the police or the army, they are characterized by an organization structured hierarchically in groups. Within one group, all the users communicate freely, but it is necessary to introduce partitioning between users of different groups. Specifically, experience shows that, in a broadcast communication mode, that is to say that each user communicates with all of the users of the group, the multiplication, in particular, of the oral interventions associated with stress situations generates a noise which prevents the transmission of pertinent information when the group exceeds about ten users.
"Partitioning can be created by the use of different transmission channels for each group. But it is also possible to combine this approach by encrypting each communication channel with a different group key in order to ensure the seal between the groups also making it possible to maintain the confidentiality of certain information.
"The only communications that can be decrypted by a terminal of the group are those generated for which the terminal has a cryptographic key which is itself attached to a group.
"The use of encrypted communications also makes it possible to maintain confidentiality of the interchanges and is therefore particularly preferred by the military and the public safety professionals who have a need to maintain confidentiality of information.
"In the prior art, the generation of the cryptographic keys is carried out by a central machine, called a key-distribution server or station, and each terminal of the network receives its cryptographic key or keys from this central machine before deployment on the ground.
"This centralized management of the cryptographic keys has the drawback of greatly limiting the possibilities of reorganization and restructuring of the network if the link with this central machine should be lost thus depriving the group organization of all impetus.
"Therefore, if, for any reason, the terminal of the group responsible for maintaining the communication link between the group and the higher hierarchy becomes unavailable, just as does any possible backup solution such as the use of a second terminal, the group is then cut off from all communication with the rest of the structure. It then becomes necessary for this group to return to a location such as a base camp or quarters where it can be reorganized and obtain new cryptographic keys allowing it to reintegrate the communication network of the structure.
Most Popular Stories
- Twitter Names Woman to Board
- Aspen Contracting Adding 300 Jobs
- Obamacare Doing Just Fine, Ky. Governor Says
- Rand Paul Signs up for Obamacare
- Hispanic Employment Improves in November
- U.S. Chamber to Run Ads in Idaho, W.Va.
- U.S. Unemployment Rate Dips to 7 Percent
- Consumer Spending Rises, Incomes Fall
- American Eagle Issues Weak Q4 Outlook
- NSA Tracks 5 Billion Cellphone Records a Day