Douglas Stebila Berkant Ustaoglu Towards Denial-of-Service-Resilient Key Agreement Protocols. 389-406 2009 ACISP http://dx.doi.org/10.1007/978-3-642-02620-1_27 conf/acisp/2009 db/conf/acisp/acisp2009.html#StebilaU09