Facilitating authentication on communication between a mobile terminal and a server is achieved. The communication is made through a Serving GPRS Support Node (SGSN) of a network in which the mobile terminal is operating. A Home Public Land Mobile Network (PLMN) of the mobile terminal generates a ciphering key for encryption of packet-switched data between the mobile terminal and the server. As part of a message from a network entity in the Home PLMN to the SGSN in which the SGSN expects to receive the ciphering key, alternative data is communicated in place of the ciphering key. Secure communication between the mobile terminal and the server is performed by applying encryption using a ciphering key generated by a network entity in a Home PLMN of the mobile terminal in messages between the mobile terminal and the server.