Key transforms to discriminate between beams in a multi-beam...

H - Electricity – 04 – B

Patent

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Details

H04B 7/185 (2006.01) H04W 12/02 (2009.01) H04W 84/06 (2009.01) H04W 88/02 (2009.01)

Patent

CA 2313548

A method and apparatus is described for transforming a key variable used for scrambling mobile data traffic between a terminal and a network in alternate ways based on a value transmitted to the terminal from the network. Transformation is accomplished by passing portions of the key variable through a series of S-boxes, which provide a mapping between inputs and outputs. The method and apparatus is explained also in the context of a satellite communications system, in which a terminal can be located in a different continent/country from the terminal's home location. Enciphered communication is enabled between the foreign satellite gateway and the roaming terminal after the foreign gateway communicates with the terminal's native gateway. The native gateway transmits one or more cipher variables in the communication. Moreover, the value determining which way to cipher the data traffic can be based on numerous factors, including aspects of the satellite communication system.

L'invention concerne un procédé et un appareil permettant de changer une variable clé utilisée pour brouiller les données mobiles échangées en alternance entre un terminal et un réseau, sur la base d'une valeur transmise par ledit réseau audit terminal. On effectue ce changement en faisant passer des parties de cette variable clé par une série de boites de substitution, qui permettent de réaliser une cartographie des entrées et des sorties. Le procédé et l'appareil de cette invention peuvent notamment être utilisés dans un système de communication par satellite, dans lequel un terminal peut être situé sur un continent ou dans un pays différent de son emplacement originel. Des transmissions chiffrées sont validées entre la passerelle du satellite étranger et le terminal itinérant, après que des communications ont été échangées entre la passerelle étrangère et la passerelle originelle dudit terminal, cette passerelle originelle transmettant une ou plusieurs variables chiffrées dans ses communications. La valeur permettant de déterminer comment chiffrer le trafic de données peut dépendre de nombreux facteurs, notamment les aspects dudit système de communication par satellite.

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