Communicating with a machine to machine device

The present disclosure provides a wireless communication module for use in a machine to machine device, M2M, the M2M device also comprising an integrated circuit card. The present disclosure also provides an integrated circuit card for use in a machine to machine device. The wireless communication module of the first aspect and the integrated circuit card of the alternative aspect are each configured for using a shared secret and at least part of a first data object to obtain a second data object from the integrated circuit card. The second data object is derived from the existing shared secret, is suitable for deriving security information and is suitable for use in establishing secure communication between the M2M device and a network application function, NAF. Many possible implementations are described using various aspects of lightweight M2M (LWM2M) standards, Generic Authentication Architecture (GAA) standards, Generic Bootstrapping Architecture (GBA) standards, OMA standards, 3GPP standards, Constrained Application Protocol (CoAP) standards and Datagram Transport Later Security (DTLS) standards.