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Can different Ciphering algorithms be used for different domains?

April 26, 2017algorithms ciphering different domains Used

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Can different Ciphering algorithms be used for different domains?

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RRC specification (25.331) does not restrict this. However RANAP specification (25.413) says that the Ciphering algorithm should be the same for both the domains. The exact text for section 8.18.2 is as follows: Upon reception of the SECURITY MODE COMMAND message, the UTRAN shall internally select appropriate algorithms, taking into account the UE/UTRAN capabilities. If a signalling connection already exists towards the other core network domain and integrity has been started, the same ciphering and integrity alternatives as being used for that core network domain shall be selected. If a signalling connection already exists towards the other core network domain and the Security Mode Control procedure is ongoing on that core network domain, the same ciphering and integrity alternative shall be selected for the two domains. This means in particular for encryption that if “no encryption” or no Encryption Information IE has been received from the first core network domain and integrity has