Security Group Key Lifetime Control for Multi-Publisher OPC UA
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Solution Overview
Problem
Current key management systems in OPC UA publish-subscribe patterns are limited as they primarily support single publishers, failing to efficiently manage security groups with multiple publishers and dynamically adjust key lifetimes based on changing bandwidths or membership.
Innovation Solution
A method and device that allow dynamic addition and management of publishers in a security group by modifying key lifetimes based on bandwidth parameters, ensuring secure data transmission and reducing the need for additional security groups by accommodating new publishers within existing groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lifetime of keys is defined by a single publisher based on its data publication amount, then key management is simple for single-publisher scenarios, but the system cannot accommodate multiple publishers in a security group
Solution Approach 1:
The patent implements dynamic key lifetime adjustment by introducing a key lifetime manager that continuously monitors the cumulative data publication amount across all publishers and dynamically modifies the key lifetime parameter. This allows the security group to adapt to changing publisher configurations and data volumes without requiring manual intervention or creating new security groups, thus accommodating multiple publishers while maintaining manageable key complexity.
Solution Approach 2:
The system changes the key lifetime parameter based on the total data publication amount of all publishers in the security group. Instead of using a static lifetime defined by a single publisher, the key lifetime is dynamically adjusted according to the aggregate publishing activity, allowing the same security group to serve multiple publishers with varying data volumes while maintaining appropriate security parameters.
2Adaptability or versatility
If key lifetime is extended to accommodate multiple publishers, then more publishers can join the security group, but security may be compromised due to increased data transmission volume
Solution Approach 1:
The key lifetime manager implements a feedback mechanism that continuously monitors the cumulative data publication amount across all publishers in the security group. Based on this feedback, the system dynamically adjusts the key lifetime parameter to ensure that keys are renewed at appropriate intervals regardless of the number of publishers or their individual data volumes, thereby maintaining security integrity while accommodating multiple publishers.
3Reliability
If separate security groups are created for each publisher, then each publisher gets dedicated key management, but the overall system complexity and key management overhead increase significantly
Solution Approach 1:
The patent merges multiple publishers into a single security group with a shared key management structure. Instead of creating separate security groups for each publisher, the system allows multiple publishers to join one security group while maintaining individual publisher identification and monitoring. The key lifetime manager tracks the cumulative data publication amount across all publishers and manages keys centrally, reducing the number of security groups from N (one per publisher) to 1, thereby significantly reducing system complexity while maintaining publisher-specific security control.
4Reliability
If key lifetime is dynamically adjusted based on cumulative data amount, then security is maintained with multiple publishers, but additional mechanisms are required to track and manage key lifetimes
Solution Approach 1:
The key lifetime manager operates as an automated self-service mechanism that autonomously monitors the cumulative data publication amount across all publishers and dynamically adjusts key lifetimes without requiring manual intervention. The system automatically detects when keys need renewal based on the monitored data volume and performs key management operations, reducing the operational complexity despite the enhanced monitoring and dynamic adjustment capabilities.
Data Source
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AI summary
The current disclosure describes a method of adding a first publisher to a security group. The method comprises receiving a key request for keys for the first publisher, the key request comprising one or more credentials associated with the first publisher and a key parameter index indicative of a bandwidth of the first publisher; modifying a lifetime value of the at least one key of the security group based on the key parameter index of the received key request, wherein an expiry of the at least one key is based on the lifetime value of the one or more keys; and transmitting the at least one key and the modified lifetime value of the at least one key to the first publisher. The first publisher is configured to publish one or more messages encrypted using the at least one key, prior to the expiry of the at least one key.