A method, an apparatus, and a computer program product for wireless communication are provided in connection with facilitating secure D2D communications in a LTE based WWAN. In one example, a UE is equipped to send a shared key request using a first non-access stratum (NAS) message to a MME, calculate a first UE key based on a MME-first UE key, an uplink count value, and at least a portion of contextual information, receive a second NAS message from the MME, and calculate a final UE key based at least on the first UE key. In another example, a MME is equipped to receive a NAS message such as the message send by the first UE, calculate a first UE key, receive a message at least indicating successful contact with the second UE, and send a second NAS message to the first UE indicating the successful contact.