Pascal Lafourcade Intruder Deduction for the Equational Theory of Exclusive-or with Commutative and Distributive Encryption. 37-57 2007 171 Electr. Notes Theor. Comput. Sci. 4 http://dx.doi.org/10.1016/j.entcs.2007.02.054 db/journals/entcs/entcs171.html#Lafourcade07