۰ Introduction

Digital community is a connected community that combines broadband communications infrastructure with flexible and service oriented computing infrastructure based on open industry standards[1]. The digital community system encompasses everything from data perception to data transmission and control system. With the pervasive introduction of additional “smart” sensors and actuators over the coming decades, cybersecurity becomes more important than ever before, necessitating the implementation of information security principle throughout the entire digital community system. Internet of Things (IoT) is the core technology of next generation and becomes focus of research in both academia and industry[2]. As an important part of digital earth, application of IoT technology is indispensable in the digital community. IoT not only accomplishes the information collection, information transmission and automatic control functions, but also enables the entire digital community system to be more convenient, secure and reliable. However, different from traditional networks, IoT owns unique characteristic including heterogeneous integration, collaborative autonomy and open interconnection, which may induce security issues for system security (privacy preservation of user, seamless connection between security protocols, etc.)[3]. Moreover, some security issues have not been fully exposed now. Once IoT is put into use in large scale, the current network architecture that seems to be secure will face a huge threat. Therefore, the security architecture of digital community must conform to strict standards at the beginning of construction. According to the actual security requirement of digital community and the characteristics of IoT, a high-assurance security trust model based on IoT technology for digital community is proposed in this paper. The rest of this paper is organized as follows: The network structure and functions of IoT-based digital community are described in Section 1. A criticality model from aircraft system that determines potential impact on system of IoT-based digital community is proposed in Section 2. In Section 3, we detail the proposed security architecture for digital community from cybersecurity and secure control aspects respectively. A high-assurance trust model for digital community is also proposed in Section 4 and a conclusion is given in Section 5.