Abstract： The ubiquitous Internet of Things integrates the Internet of Things into the Internet, breaks the data island, and makes a large number of devices in a more complex network environment, with more prominent security risks. The traditional public key cryptography infrastructure(PKI) security scheme has high cost and complex management of digital certificate, which is not suitable for the security construction of ubiquitous Internet of Things. Identity based cryptosystem (IBC) eliminates the problem of exchanging a large number of digital certificates in security applications, and is easier to deploy and use. Based on the IBC cryptographic standard SM9 formulated in China, this paper puts forward the lightweight security scheme of ubiquitous Internet of Things, designs the SM9 secret key infrastructure, analyzes the system implementation ways, and solves the security problems such as equipment access and management, peer-to-peer authentication, confidential communication, key data protection and so on. The proposed scheme has the characteristics of lightweight, low overhead, high system autonomy and less manual management. It is suitable for the deployment, operation and maintenance of ubiquitous Internet of Things environment.
Key words : ubiquitous Internet of Things,；SM9；PKI,；secret key infrastructure
