With the fast development of digital technologies, we are running into a digital world. The relationship among people and the connections among things become more and more complex, and new challenges arise. To tackle these challenges, trust-a soft security mechanism-is considered as a promising technology. Thus, in this survey, we do a comprehensive study on the trust and trust modelling for the future digital world. We revisit the definitions and properties of trust, and analysis the trust theories and discuss their impact on digital trust modelling. We analyze the digital world and its corresponding environment where people, things, and infrastructure connect with each other. We detail the challenges that require trust in these digital scenarios. Under our analysis of trust and the digital world, we define different types of trust relationships and find out the factors that are needed to ensure a fully representative model. Next, to meet the challenges of digital trust modelling, comprehensive trust model evaluation criteria are proposed, and potential securities and privacy issues of trust modelling are analyzed. Finally, we provide a wide-ranging analysis of different methodologies, mathematical theories, and how they can be applied to trust modelling.
翻译：随着数字技术的快速发展,我们正在进入一个数字世界。人与人之间的关系以及人与人之间的相互联系变得越来越复杂,并出现了新的挑战。为了应对这些挑战,信任软安全机制被视为有希望的技术。因此,我们在这次调查中,对未来数字世界的信托和信任建模进行了全面研究。我们重新审视信任的定义和性质,分析信任理论,并讨论信任理论对数字信任建模的影响。我们分析了数字世界及其与人、物和基础设施相互联系的相应环境。我们详细分析了在数字情景中需要信任的挑战。根据我们对信任和数字世界的分析,我们定义了不同类型的信任关系,并找出了确保具有充分代表性的模式所需要的因素。接下来,我们提出了数字信任建模、全面信任模型评价标准,并分析了信任建模的潜在证券和隐私问题。最后,我们提供了对不同方法、数学理论以及如何将其应用于信任建模的广泛分析。
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