Arnab Roy Anupam Datta John C. Mitchell Formal Proofs of Cryptographic Security of Diffie-Hellman-Based Protocols. 312-329 2007 TGC http://dx.doi.org/10.1007/978-3-540-78663-4_21 conf/tgc/2007 db/conf/tgc/tgc2007.html#RoyDM07