Formalisation of ["Noninterference, Transitivity, and Channel-Control Security Policies"](http://www.csl.sri.com/papers/csl-92-2/) by John Rushby.

Requires [std++](https://gitlab.mpi-sws.org/robbertkrebbers/coq-stdpp).

The proofs are in `Rushby.v` and one instantiation is in `ArrayMachine.v`.


BEWARE!!! I wrote this formalization when I started my PhD, and I
didn't know much about (idiomatic) Coq back then. As a result, the
code is quite shitty.