Dynamic Encrypted Subscriber Identity for TETRA Privacy
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Solution Overview
Problem
In Terrestrial Trunked Radio Access (TETRA) networks, the static nature of encrypted subscriber identities over the air interface allows for potential tracking of user terminals, compromising location privacy, as the same encrypted identity is used within a location area or the entire network.
Innovation Solution
A method and apparatus that generate and use temporary or modified encrypted subscriber identities, which change dynamically based on parameters like cipher keys and location-specific information, ensuring that only authorized users can identify messages intended for them, thereby enhancing privacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a static encrypted identity is used over the air interface, then the implementation is simple and backward compatible, but the location privacy of user terminals is compromised and tracking becomes possible
Solution Approach 1:
The patent applies dynamics by transitioning from a static encrypted identity to a dynamic temporary encrypted identity that changes over time. The temporary encrypted identity is generated by modifying the original encrypted identity using a modification value derived from current time or frame numbers, ensuring the identity evolves continuously to prevent tracking while maintaining system simplicity
Solution Approach 2:
The patent changes the parameter of the encrypted identity by introducing a modification value that alters the original encrypted identity. This modification value is generated based on time or frame number parameters, transforming the static identity into a time-varying identity that maintains privacy protection without significantly increasing system complexity
2Object-affected harmful factors
If a dynamic temporary encrypted identity is generated and used, then location privacy is enhanced and tracking is prevented, but the system complexity increases
Solution Approach 1:
The system implements dynamics by making the encrypted identity time-varying through the use of temporary encrypted identities. These identities are generated by applying a modification value to the original encrypted identity, where the modification value changes with time or frame numbers, thereby enhancing privacy while using a systematic approach to manage the increased complexity
Solution Approach 2:
The patent manages complexity by systematically changing identity parameters through controlled modification. The temporary encrypted identity is derived from the original encrypted identity using a modification value based on time or frame numbers, providing a structured method to enhance privacy without arbitrary complexity increases
3Object-affected harmful factors
If the encrypted identity changes frequently, then tracking difficulty increases and privacy is improved, but the stability of identity recognition may be affected
Solution Approach 1:
The patent resolves the stability conflict by implementing controlled dynamics. The temporary encrypted identity changes over time through modification values derived from time or frame numbers, making tracking difficult while maintaining a systematic structure that ensures proper identity recognition and network functionality
4Object-affected harmful factors
If a modified encrypted identity scheme is implemented, then location privacy is enhanced, but compatibility with legacy systems may be compromised
Solution Approach 1:
The patent uses an intermediary approach by introducing a temporary encrypted identity that serves as a bridge between the original encrypted identity and the privacy-enhanced requirement. The modification value acts as an intermediary element that transforms the original identity into a protective form while maintaining the underlying structure that legacy systems can recognize and process
Data Source
Figure 1~3
Figure 4A~4C
Figure 4D~4E
AI summary
To provide encrypted identities with a more dynamic nature, an encrypted identity is modified by an algorithm using the encrypted identity and one or more parameter values as inputs of the algorithm, the algorithm outputting a modified encrypted identity that is used in information transmitted over an air interface.