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Polynomial Kernels and User Reductions for the Workflow Satisfiability Problem

机译:工作流可满足性问题的多项式核和用户约简

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The workflow satisfiability problem (wsp) is a problem of practical interest that arises whenever tasks need to be performed by authorized users, subject to constraints defined by business rules. We are required to decide whether there exists a plan-an assignment of tasks to authorized users-such that all constraints are satisfied. The wsp is, in fact, the conservative constraint satisfaction problem (i.e., for each variable, here called task, we have a unary authorization constraint) and is, thus, -complete. It was observed by Wang and Li (ACM Trans Inf Syst Secur 13(4):40, 2010) that the number of tasks is often quite small and so can be used as a parameter, and several subsequent works have studied the parameterized complexity of wsp regarding parameter . We take a more detailed look at the kernelization complexity of wsp( ) when denotes a finite or infinite set of allowed constraints. Our main result is a dichotomy for the case that all constraints in are regular: (1) We are able to reduce the number of users to . This entails a kernelization to size poly for finite , and, under mild technical conditions, to size poly for infinite , where denotes the number of constraints. (2) Already wsp( ) for some allows no polynomial kernelization in unless the polynomial hierarchy collapses.
机译:工作流可满足性问题(wsp)是实际需要解决的问题,每当需要授权用户执行任务时,都会受到业务规则定义的约束的影响。我们需要决定是否存在计划-将任务分配给授权用户-以便满足所有约束条件。实际上,wsp是保守约束满足问题(即,对于每个变量,在这里称为任务,我们具有一元授权约束),因此,-sp是完整的。 Wang和Li(ACM Trans Inf Syst Secur 13(4):40,2010)观察到,任务数量通常很小,因此可以用作参数,随后的几项工作研究了参数化的复杂度。关于参数的wsp。当wsp()表示允许的约束的有限或无限集合时,我们将更详细地研究wsp()的内核化复杂度。对于所有约束都是规则的情况,我们的主要结果是二分法:(1)我们能够将用户数量减少到。这就需要对poly的大小进行有限化,在温和的技术条件下,对poly的大小进行无限化,其中表示约束的数量。 (2)除非多项式层次结构崩溃,否则对于某些人而言,wsp()已经不允许进行多项式内核化。

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