more robust: assume that database is exclusive for this Progress instance --- always close on exit (see also bf377e10ff3b);
(* Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1996 University of Cambridge
*)
section \<open>Blanqui's "guard" concept: protocol-independent secrecy\<close>
theory Auth_Guard_Public
imports
P1
P2
Guard_NS_Public
Proto
begin
end