Hyperproperties are properties that refer to multiple computation traces.
This includes many information-flow security policies, such as observational
determinism, (generalized) noninterference, and noninference, and other system
properties like symmetry or Hamming distances between in error-resistant codes.
We introduce MGHyper, a tool for automatic satisfiability checking and model
generation for hyperproperties expressed in HyperLTL. Unlike previous
satisfiability checkers, MGHyper is not limited to the decidable ∃∗∀∗ fragment of HyperLTL, but provides a semi-decisionprocedure for the
full logic. An important application of MGHyper is to automatically check
equivalences between different hyperproperties (and different formalizations of
the same hyperproperty) and to build counterexamples that disprove a certain
claimed implication. We describe the semi-decisionprocedure implemented in
MGHyper and report on experimental results obtained both with typical
hyperproperties from the literature and with randomly generated HyperLTL
formulas