Dynamic Access Control Using Blockchain-Based Reliability Scoring
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Solution Overview
Problem
Existing access control methods fail to dynamically adjust access permissions based on fluctuating risks in a system due to unreliable components or applications, making it difficult to determine the extent of the risk and its impact on system operation, especially in complex supply chains with multiple manufacturers and varying reliability levels.
Innovation Solution
An access control apparatus and method that utilizes a risk target list, trail information management, score calculation, and determination of access control based on a reliability score, managed through a blockchain trail management server, to dynamically adjust access permissions based on fluctuating risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rule-based access control methods are used, then access permissions can be controlled based on simple vulnerability levels, but the system cannot comprehensively judge reliability in complex supply chains with multiple manufacturers and ambiguous information
Solution Approach 1:
The patent segments the supply chain reliability assessment into multiple independent components: manufacturer reliability scores, component reliability scores, and application reliability scores. Each component is evaluated separately using blockchain-trusted trail information, allowing the system to handle complex supply chains by breaking them down into manageable segments that can be individually assessed and weighted.
Solution Approach 2:
The patent implements dynamic access control by continuously updating reliability scores based on real-time supply chain events. The system dynamically adjusts access permissions according to the current reliability state of apparatuses, transitioning from static rule-based control to dynamic score-based control that adapts to changing supply chain conditions.
2Reliability
If shutdown or access prohibition is applied when multiple parts have problems, then system security is improved, but continuous operation is restricted and productivity decreases
Solution Approach 1:
The patent applies local quality by differentiating the impact of reliability issues across different components. Instead of applying uniform shutdown policies to all parts with vulnerabilities, the system calculates weighted reliability scores that consider the specific importance of each component to the overall system function, allowing selective access control that maintains continuous operation where safe.
Solution Approach 2:
The patent changes the parameter of access control from binary (allow/denied) to continuous based on reliability scores. Access permissions are adjusted according to the numerical reliability score of each apparatus, enabling fine-grained control that balances security requirements with operational continuity, allowing systems to operate at reduced but acceptable security levels rather than shutting down completely.
3Ease of operation
If simple scoring methods are used for risk assessment, then the evaluation process is simplified, but the system cannot accurately assess ambiguous risks in multi-supplier supply chains
Solution Approach 1:
The patent implements feedback mechanisms by continuously monitoring supply chain events and updating reliability scores based on actual performance data. Blockchain-trusted trail information provides verifiable feedback about manufacturer behavior, component failures, and application performance, enabling more accurate risk assessment that learns from historical data while maintaining operational simplicity through automated score calculations.
Data Source
AI summary
An access control apparatus includes risk target list registration part which registers a dynamically fluctuating risk that has occurred during an operation of apparatus accessing system in a risk target list; trail information management part which collects and manages trail information concerning the apparatus which relates to the occurred risk from trail management server which manages trail information of a supply chain using block chain; score calculation part which calculates a score of the apparatus based on the risk registered in the risk target list and the trail information concerning the apparatus; determination part which determines a control method of an access by the apparatus to the system based on the score of the apparatus and a policy defining relationship between the score and the control method of an access; and control part which controls the access by the apparatus to system according to the control method of the access.