Node for use by a network, a system for interconnecting multiple networks and methods of operating the node and system

Abstract

There is provided a method of operating a node () for use by a first network (), the first network () applies an authentication process to allow a subscriber access to a network, wherein authentication information used in the authentication process is derived using a key associated with a subscriber identity of a subscriber, the key being stored in either a location within the first network () or external to the first network (). The method includes storing () information regarding the locations at which keys associated with subscriber identities are stored, receiving () a request for authentication information, the request indicating the subscriber identity to which the request for authentication information relates, retrieving () information regarding the location at which the key associated with the subscriber identity is stored using the subscriber identity, and routing () the request for authentication information according to the retrieved information.