Methods, apparatuses, and computer program products for...

H - Electricity – 04 – W

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H04W 12/04 (2009.01)

Patent

CA 2716681

A method, apparatus and computer pro-gram product are provided to provide cryptographical key separation for handovers. A method is provided which in-cludes calculating a key based at least in part upon a previ-ously stored first intermediary value. The method also in-cludes calculating a second intermediary value based at least in part upon the calculated key. The method addition-ally includes sending a path switch acknowledgement in-cluding the second intermediary value to a target access point. The method may further include receiving a path switch message including an indication of a cell identifica-tion and calculating the encryption key based upon the in-dication of the cell identification. The method may further include storing the second intermediary value. The calcula-tion of the key may further comprise calculating the key following a radio link handover. Corresponding apparatus-es and computer program products are also provided.

L'invention porte sur un procédé, un appareil et un produit de programme d'ordinateur pour fournir une séparation de clé cryptographique pour des transferts. Le procédé comprend le calcul d'une clé sur la base, au moins en partie, d'une première valeur intermédiaire précédemment stockée. Le procédé comprend également le calcul d'une seconde valeur intermédiaire sur la base, au moins en partie, de la clé calculée. Le procédé comprend de plus l'envoi d'un accusé de réception de commutation de trajet, incluant la seconde valeur intermédiaire, à un point d'accès cible. Le procédé peut en outre comprendre la réception d'un message de commutation de trajet incluant une indication d'une identification de cellule et le calcul de la clé de cryptage sur la base de l'indication de l'identification de cellule. Le procédé peut en outre comprendre le stockage de la seconde valeur intermédiaire. Le calcul de la clé peut en outre comprendre le calcul de la clé à la suite d'un transfert de liaison radio. L'invention porte également sur des dispositifs et des produits de programme d'ordinateur correspondants.

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