Subordinate Certificate Authority for IoT Device Provisioning
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Solution Overview
Problem
Securing network connections for Internet of Things (IoT) devices, particularly voice devices, is challenging due to their limited human-machine interfaces and the need for reliable, easy-to-set-up networking safeguards in enterprise environments.
Innovation Solution
Implementing a subordinate certificate authority system that provides device certificates chained off a root certificate, enabling secure access to enterprise networks and remote services while allowing flexibility in security protocols, using a setup system to establish point-to-point connections and manage certificate signing requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional network security protocols are implemented for IoT devices, then network security is improved, but device complexity and ease of operation deteriorate due to limited HMI capabilities
Solution Approach 1:
The system enables self-service provisioning where IoT devices automatically obtain certificates and establish secure connections without manual HMI interaction. The device generates certificate signing requests, receives signed certificates from a CA, and configures security credentials autonomously, eliminating the need for users to manually configure complex security settings on devices with limited interfaces.
Solution Approach 2:
A certificate authority system acts as an intermediary between the enterprise network and IoT devices. The CA receives signing requests from devices, issues signed certificates, and manages credential distribution centrally. This intermediary handles the complexity of security protocol management, allowing devices with limited HMI to participate in secure enterprise networks through simplified automated processes.
2Reliability
If manual certificate provisioning is used for IoT devices, then security control is improved, but productivity and ease of operation worsen due to time-consuming setup processes
Solution Approach 1:
The system performs preliminary actions by pre-configuring certificate authorities and establishing trust relationships before IoT devices need to connect to the enterprise network. The CA is pre-provisioned with enterprise security policies and root certificates, enabling it to automatically issue signed certificates to devices as they join the network, eliminating the need for manual security configuration at the point of deployment.
Solution Approach 2:
IoT devices autonomously initiate the certificate provisioning process by generating and sending signing requests to the CA. The devices self-configure their security credentials by receiving and installing signed certificates automatically. This self-service approach maintains security control through centralized CA management while dramatically improving setup efficiency by eliminating manual intervention.
3Adaptability or versatility
If standardized security protocols are implemented across all devices, then adaptability to enterprise networks is improved, but device complexity increases for devices with limited HMI
Solution Approach 1:
The certificate authority serves as an intermediary that translates standardized enterprise security requirements into device-specific credential configurations. The CA receives signing requests from diverse IoT devices with varying capabilities, applies enterprise security policies uniformly, and issues appropriate certificates. This intermediary layer enables standardized security protocol implementation across the enterprise network while shielding individual devices from provisioning complexity.
Solution Approach 2:
IoT devices with limited HMI perform self-provisioning by automatically generating certificate signing requests and installing received certificates without user intervention. The automated process handles the complexity of security protocol adaptation, allowing devices to conform to enterprise network standards through autonomous credential management rather than requiring users to navigate complex security configurations.
Data Source
AI summary
This disclosure is directed to computing services that provide secure network connections using public-private key-based security for Internet of Things (IoT) devices, such as voice devices, that may have more than a predefined set of users. Device certificates that authorize IoT devices to access a secure network, such as an enterprise network and/or services eternal to an enterprise network are provided. A setup system may cooperate with an IoT device and a subordinate CA to generate a device certificate that allows the IoT device to access a secure enterprise network and services outside of the secure enterprise network. The IoT device may generate a certificate signing request (CSR) which may be signed by a remote subordinate CA to generate the device certificate using a root certificate of an enterprise CA. Systems are also disclosed that renew certificates for the IoT devices prior to their expiration.