User Identification Module Parameter Modification
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Solution Overview
Problem
User identification modules in mobile communications are not modifiable without compromising security, making it difficult to change network operators, especially for telematics devices, resulting in resource wastage and loss of personal data.
Innovation Solution
A user identification module with a first modifiable data item referencing unmodifiable second data items, allowing secure modification of parameters like IMSI and cryptographic keys without adding unauthorized values, by changing the reference to access different values stored within the module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parameters in user identification module are stored in non-modifiable manner for security, then security is improved, but adaptability deteriorates
Solution Approach 1:
The parameter storage is segmented into multiple separate data items (first data item containing reference, second data items containing actual parameter values). This segmentation allows the reference to be modified while the actual parameter values remain secure and unmodifiable, resolving the contradiction between security and adaptability.
Solution Approach 2:
A reference mechanism acts as an intermediary between the modifiable part (reference in first data item) and the unmodifiable secure part (parameter values in second data items). This intermediary allows indirect modification of parameters through reference changes without directly altering the secure stored values, enabling adaptability while maintaining security.
2Adaptability or versatility
If user identification module is replaced to change network operator, then adaptability is improved, but device complexity and resource consumption worsen
Solution Approach 1:
The ability to change network operator is extracted from the physical module replacement action and implemented through software-based reference modification. Instead of taking out and replacing the entire user identification module, the system extracts and modifies only the reference data item, simplifying the complexity while maintaining adaptability.
Solution Approach 2:
The network operator identification parameters are changed by modifying the reference in the first data item to point to different second data items containing different operator-specific parameter values. This parameter change approach allows network operator switching without physical module replacement, reducing device complexity and resource consumption.
3Reliability
If parameters are stored in unmodifiable manner, then security is improved, but ease of operation deteriorates
Solution Approach 1:
The system implements dynamic characteristics by allowing the reference in the first data item to be modified while keeping the actual parameter values in second data items static and secure. This dynamic reference mechanism enables easy parameter modification through reference updates without compromising the security of the stored parameter values, improving ease of operation while maintaining security.
Data Source
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Figure 3
AI summary
For being able to change a value of a parameter stored in a user identification module, the invention suggests a user identification module (105), particularly for use in a mobile communication device (101). The user identification module (105) comprises a first data item being accessible for reading a value of parameter used in the operation of the user identification module (105), and at least two second data items, the second data items being unmodifiable and each second data item including a value of a parameter provided by the user identification module (105), the first data item including a modifiable reference addressing one second data item. Further on, the invention relates to a method for changing of a parameter stored in a user identification module.