Methods And Apparatus For Direct Communication Key Establishment Methods (100, 200, 300) and apparatus (400, 500, 600, 700, 800, 900) are disclosed for establishing a key for direct communication between a User Equipment device, UE, and a device. The methods and apparatus cooperate to form a system for securing direct communication between a UE and a device over an interface. The system comprises a UE (20), a device (30) and a Direct Communication Element (40). The Direct Communication Element (40) is configured to obtain a shared session key and Generic Bootstrapping Architecture Push Information, GPI, to derive a direct communication key from at least the shared session key, and to send the direct communication key and the GPI to the device (30). The device (30) is configured to send the GPI to the UE (20). The UE (20) is configured to derive the shared session key from at least the GPI and to derive the direct communication key from the shared session key. Also disclosed are a computer product operable to carry out methods according to the present invention and a computer program product comprising a computer readable medium having such a computer product stored thereon.