Use of duplex cipher algorithms for satellite channels with...

Details Use of duplex cipher algorithms for satellite channels with... Use of duplex cipher algorithms for satellite channels with...

H - Electricity

04

L

H04L 9/12 (2006.01) H04B 7/185 (2006.01) H04B 7/212 (2006.01) H04L 9/18 (2006.01)

Patent

CA 2268656

An apparatus and method for ciphering traffic exachanged in both directions between a satellite/cellular telephone and a ground station network using an orbitial satellite. A buffer memory is provided at either the mobile telephone station or the ground network station or both. The buffer memory is used to store the deciphering bits output from a duplex ciphering algorithm at the time the ciphering bits are generated. The stored ciphering bits are used to decipher a later-to-be-received traffic information block. The delay in using stored deciphering bits is determined for each call at call set-up to the nearest integer number of block periods by measuring the loop propagation delay from the ground station to the mobile telephone station during an exchange of signals at call set-up.

Dispositif et procédé servant à chiffrer le trafic échangé dans les deux sens entre un téléphone cellulaire/satellite et une station terrestre dont le réseau utilise un satellite orbital. Une mémoire tampon se trouve, soit au niveau de la station téléphonique mobile, soit au niveau de la station de réseau terrestre, ou des deux. On utilise cette mémoire tampon afin de mémoriser la sortie binaire de déchiffrement à partir d'un algorithme de chiffrement duplex simultanément à la génération des bits de chiffrement. On utilise les bits de chiffrement mémorisés afin de déchiffrer un bloc d'information de trafic à réception plus tardive. On détermine le retard d'utilisation de bits de déchiffrement mémorisés pour chaque appel à l'établissement de l'appel au nombre entier le plus proche de périodes de blocs en mesurant le retard de propagation en boucle depuis la station terrestre vers la station téléphonique mobile pendant un échange de signaux à l'établissement de l'appel.

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