Abstract: A group key is computed based on unique identifications of each member device of a group of machine type communication devices, wherein communication with a network application function is performed by using a session identification of the group, and/or by using a session identification of a member device of the group, generated based on the session identification of the group and the unique identification of the member device.

Abstract: A group key is computed based on unique identifications of each member device of a group of machine type communication devices, wherein communication with a network application function is performed by using a session identification of the group, and/or by using a session identification of a member device of the group, generated based on the session identification of the group and the unique identification of the member device.

Abstract: A user account recovery method is described. The method includes storing an account recovery token at both an identity management system (IDM) and a service provider. In response to an indication that a user cannot access an account, a request for the account recovery token is sent by the relevant service provider to the IDM. On confirming the identity of the user, the IDM retrieves the account recovery token and returns the token to the service provider. The service provider compares the token received from the IDM with one or more locally stored tokens to initiate an account recovery process (which process may, for example, include prompting the user to provide a new password for the account).