Scalable Certificate Management System Architecture
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Solution Overview
Problem
Existing systems for securely provisioning digital assets in computerized devices, such as IoT devices, face challenges in preventing unauthorized software changes and ensuring safe operation, as they often rely on pre-existing secret security materials that can be compromised, leading to insecure initial provisioning.
Innovation Solution
A scalable certificate management system (CMS) is implemented, which includes a registration authority, linkage authorities, pseudonym certificate authority, and load balancers to securely generate and provide digital assets like security credentials and digital certificates, using cryptographic computations and message queues to ensure secure provisioning and authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-existing secret security materials are used for initial provisioning, then device authentication is enabled, but security vulnerability increases due to potential compromise of these materials
Solution Approach 1:
The system performs preliminary actions by pre-distributing certificate authorities (CAs) to devices during manufacturing before deployment. These pre-distributed CAs enable devices to authenticate servers and other devices without requiring real-time connection to a central provisioning authority, thus enabling authentication while reducing security vulnerabilities associated with centralized secret management.
Solution Approach 2:
The security architecture is segmented by distributing multiple certificate authorities to different devices rather than relying on a single centralized secret. Each device receives a subset of CAs, and the system uses hierarchical trust relationships where devices can verify certificates through multiple potential CAs. This segmentation eliminates the single point of failure represented by pre-existing secret materials.
2Reliability
If a centralized certificate management system is used, then security control is improved, but system complexity and scalability are worsened
Solution Approach 1:
The certificate management system is segmented into distributed components where each device maintains its own certificate store and can independently verify certificates using pre-distributed CAs. This eliminates the need for a complex centralized management infrastructure while maintaining security control through cryptographic verification.
Solution Approach 2:
Devices are empowered to self-verify certificates and authenticate connections without requiring real-time interaction with a centralized certificate authority. The pre-distributed CAs enable devices to independently validate certificates, reducing system complexity while maintaining security control through decentralized self-service authentication.
3Ease of operation
If traditional provisioning methods are used, then initial setup is simplified, but security against unauthorized software installation is worsened
Solution Approach 1:
Certificate authorities and trust relationships are established during the manufacturing phase before devices are deployed. This preliminary setup includes pre-distributing CAs and establishing hierarchical trust structures, which simplifies initial device setup while enabling robust security verification against unauthorized software installation through cryptographic certificate validation.
Data Source
AI summary
An example system may include one or more application platforms (e.g., VMs) that run a registration authority and are communicatively connected to one or more compute engines that perform cryptographic computations required by the registration authority. The system may also include one or more application platforms that run a certificate authority and that are communicatively connected to one or more compute engines that perform cryptographic computations required by the certificate authority. It may also include one or more load balancers communicatively connected to the one or more compute engines, the one or more load balancers to perform operations comprising distributing at least one request to the one or more compute engines.