Kryptering av brukerdata i satelittnett med GPRS/UMTS arkitektur

摘要

A satellite telecommunication system using GPRS/UMTS architecture and adapted to establish a "direct" terminal-to-terminal user data path for terminals communicating through the same satellite, offers secure end-to-end communication by separate encryption of user data. A ciphering server associated with the SGSN of the terminals generates and provides ciphering information (algorithm, encryption keys). The ciphering information is carried, to the user terminals seeking to communicate, on the secure signalling channels that were established during the attach procedure, preferably embedded in the Activate PDP Context Accept message.