Advancement in technology with the proliferation of new wireless communication protocols gave rise to the new era of ubiquitous computing, called Internet of Things (IoT). IoT facilitates connectivity between various heterogeneous physical devices through the internet to advantage users with intelligent and more advanced services. Effective utilization of these services demands a secure system where one can rely on the source of the information together with the received information. Trust Management (TM) is a crucial aspect of security that aims to maintain reliability in a system by ensuring the secure exchange of information. Using the concept of local and global perception about the reputation, TM measures the degree of trust on the system’s entities and endeavors to reduce risk and uncertainty in the system. For IoT, TM paves the way to accomplish various decision-making tasks, like reliable service composition, secure routing, device authentication, access control, etc. However, design and deployment of TM for IoT are hindered by the inherent characteristics of IoT systems that demand to be addressed.

In this paper, we identified various applications of TM and examined issues in the design and deployment of TM for IoT. A clear vision towards TM system, explaining the different phases involved in the process of managing the trust, is presented. Furthermore, an exhaustive survey on various TM schemes developed for IoT with their applicability and addressing issues is provided. The survey is conducted considering direct observations and indirect recommendations based distributed, semi-distributed, and centralized schemes along with the review on blockchain technology-based schemes for trust management in IoT. In addition to that, a comparative study of the existing schemes based on the various system measures like computation model, input attributes, evaluation tool, and performance metrics examining their strengths and weaknesses is given. Finally, the paper highlights open research challenges investigated by the survey to present future direction for the researchers.

随着新的无线通信协议的发展，技术的进步带来了无处不在的计算新时代，即物联网（IoT）。物联网通过互联网促进各种异构物理设备之间的连接，从而为用户提供智能和更高级的服务。有效利用这些服务需要一种安全的系统，在该系统中，人们可以依赖信息源和接收到的信息。信任管理（TM）是安全性的关键方面，旨在通过确保安全地交换信息来维持系统的可靠性。使用对信誉的本地和全球感知的概念，TM可以衡量对系统实体的信任程度，并努力降低系统中的风险和不确定性。对于物联网，

在本文中，我们确定了TM的各种应用，并研究了用于物联网的TM的设计和部署中的问题。提出了对TM系统的清晰愿景，解释了管理信任过程所涉及的不同阶段。此外，提供了针对物联网开发的各种TM方案的详尽调查，包括其适用性和解决问题。此次调查考虑了基于分布式，半分布式和集中式方案的直接观察和间接建议，以及对基于区块链技术的物联网信任管理方案的审查。除此之外，还基于计算模型，输入属性，评估工具以及检查其优缺点的性能指标等各种系统度量对现有方案进行了比较研究。