The LTE/SAE (Long Term Evolution/System Architecture Evolution) architecture design is greatly different from the
existing network (3G) which brings with it a need to adapt and improve the security functions. In fact, the security issues
in telecommunications networks will be surely a big discussion subject in the next few years whither the delay remains
very important and should be minimized. Thus, the Handover Keying Working Group (HOKEY) tries to reduce the delay
caused by the authentication once the mobile user changes its location. Therefore, the focus of this paper is to make a brief
discussion of the IETF HOKEY solution to fast authenticate the subscribers during the handover in the LTE/SAE network.