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arXiv 2204.08896cs.LOcs.AI
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信息共享系统中战略能力的模型检验

Model Checking Strategic Abilities in Information-sharing Systems

Francesco Belardinelli, Ioana Boureanu, Catalin Dima, Vadim Malvone

摘要:

我们引入了一个子类的并发游戏结构(CGS)与不完美的信息,其中代理人被赋予私人数据共享能力。重要的是,我们的CGS是这样的,它仍然是可判定的模型检查这些CGS对ATL的相关片段。这些系统可以被认为是允许信息分叉的体系结构的概括,在这个意义上,在系统的初始状态下,我们允许从给定集合A外部的代理到该A内部的代理的信息分叉。由于这个原因,再加上我们的模型中的通信支持了一种特殊形式的广播,我们称我们的形式主义为A-cast系统。为了强调,ATL的片段,我们证明了模型检查问题在A-cast上是可判定的,这是一个大而重要的片段;它表达了集合A的任何子集中的Agent上的联盟。事实上,正如我们所展示的,我们的系统和ATL片段可以编码出难以忠实表达的安全问题:身份方案中的恐怖分子欺诈攻击。

英文摘要:

We introduce a subclass of concurrent game structures (CGS) with imperfect information in which agents are endowed with private data-sharing capabilities. Importantly, our CGSs are such that it is still decidable to model-check these CGSs against a relevant fragment of ATL. These systems can be thought as a generalisation of architectures allowing information forks, in the sense that, in the initial states of the system, we allow information forks from agents outside a given set A to agents inside this A. For this reason, together with the fact that the communication in our models underpins a specialised form of broadcast, we call our formalism A-cast systems. To underline, the fragment of ATL for which we show the model-checking problem to be decidable over A-cast is a large and significant one; it expresses coalitions over agents in any subset of the set A. Indeed, as we show, our systems and this ATL fragments can encode security problems that are notoriously hard to express faithfully: terrorist-fraud attacks in identity schemes.

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