  It is shown that under reasonable assumptions a Drake-style equation can be
obtained for the probability that our universe is the result of a deliberate
simulation. Evaluating loose bounds for certain terms in the equation shows
that the probability is unlikely to be as high as previously reported in the
literature, especially in a scenario where the simulations are recursive.
Furthermore, we investigate the possibility of eavesdropping from the outside
of such a simulation and introduce a general attack that can circumvent
attempts at quantum cryptography inside the simulation, even if the quantum
properties of the simulation are genuine.
