The Internet of Things (IoT) can integrate both the physical and the information world to provide applications and services. IoT networks permit users, applications and devices in various physical locations for easy and seamless communication with each other. Data are sometimes quite sensitive in nature based on whether they are from one single IoT subsystem or an aggregation of multiple systems. Securing data becomes crucial and data access will have to be controlled. The IoT cloud can pose several challenges to the scale of IoT systems that help in identifying all real challenges in the cloud services. The main components of the access control mechanisms are authentication and authorization. Trust can permit the device with a natural judging method for other devices and the way in which security can be handled along with access control. A trust relationship between two different devices will help in influencing the future behaviour of interactions. Trust-based systems have been proposed in the literature, but not much work has been done to decrease the computational time in encryption system which is critical for low powered sensor devices. This work proposed a novel authentication mechanism ”Trust-Level-Public Key Authentication” which is used to connect between the nodes for data transfer which is efficient. This work was supported by a system of remote key management in the cloud and used for aggregating encrypted data. The levels of authorization in the nodes were controlled remotely. The experimental results showed that average consumption of energy (J) with the trust system to have performed better by about 11.5%, 12.6%, 17.6%, 14.2%, 13.5% and by about 15.9% when compared to the average consumption of energy (J) without a trust system that is used for the number of nodes 250, 500, 750, 1000, 1250, and 1500, respectively.

物联网（IoT）可以集成物理世界和信息世界，以提供应用程序和服务。物联网网络允许用户，应用程序和设备处于不同的物理位置，从而彼此之间轻松无缝地通信。基于数据是来自单个IoT子系统还是来自多个系统的聚合，有时数据在本质上有时非常敏感。保护数据变得至关重要，必须控制数据访问。物联网云可能会对物联网系统的规模带来若干挑战，有助于识别云服务中的所有实际挑战。访问控制机制的主要组件是身份验证和授权。信任可以使设备具有对其他设备的自然判断方法，以及可以与访问控制一起处理安全性的方式。两个不同设备之间的信任关系将有助于影响交互的未来行为。在文献中已经提出了基于信任的系统，但是在减少对低功率传感器设备至关重要的加密系统中的计算时间方面，没有做太多的工作。这项工作提出了一种新颖的身份验证机制“信任级别-公共密钥身份验证”，该机制用于连接节点之间以进行有效的数据传输。这项工作得到了云中远程密钥管理系统的支持，并用于聚合加密数据。节点中的授权级别是远程控制的。实验结果表明，使用信任系统的平均能耗（J）分别提高了约11.5％，12.6％，17.6％，14.2％，13.5％和约15。