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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
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