Method and apparatus for efficient irregular synchronization...

Details Method and apparatus for efficient irregular synchronization... Method and apparatus for efficient irregular synchronization...

H - Electricity

04

L

H04L 9/12 (2006.01)

Patent

CA 2389397

A method and apparatus for efficiently synchronizing a stream cipher. State information is transmitted that will allow the intented recipient of the encrypted data stream to set a stream cipher generator to the correct state from which to start generating the stream cipher. A cycle number indicating the current state of a linear feedback shift register and a stutter number indicating whether an output of the linear feedback shift register is dropped are both transmitted to a remote station along with the encrypted data stream.

L'invention porte sur un procédé et un appareil de synchronisation efficace d'un code chaîné. On transmet des informations d'état qui permettront au destinataire prévu du train de données crypté de placer un générateur de code chaîné dans l'état requis à partir duquel on peut commencer à créer le code chaîné. Un nombre cyclique indiquant l'état actuel d'un registre à décalage à rebouclage linéaire, ainsi qu'un nombre de saut indiquant si une sortie dudit registre a été ou non sautée sont tous deux transmis à une station distante ainsi que le code chaîné.

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