Corinna Schmitt, Burkhard Stiller, Thomas Kothmayr, Wen Hu: DTLS-based Security with two-way Authentication for IoT (Version 00); IETF, online, Fremont, California, U.S.A., July 2013, URL: http://tools.ietf.org/html/draft-schmitt-two-way-authentication-for-iot-00.