Paul Hankes Drielsma Sebastian Mödersheim Luca Viganò David A. Basin Formalizing and Analyzing Sender Invariance. 80-95 2006 conf/ifip1-7/2006 Formal Aspects in Security and Trust http://dx.doi.org/10.1007/978-3-540-75227-1_6 db/conf/ifip1-7/fast2006.html#DrielsmaMVB06