Tamper Detect Pattern for Mobile Terminal Case Disassembly
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Solution Overview
Problem
Existing mobile terminals are vulnerable to tampering methods that deceive the case disassembling recognition system, such as injecting conductive liquid into the tamper detect pattern, which can falsely indicate assembly and prevent detection of disassembly.
Innovation Solution
A mobile terminal design featuring a tamper detect pattern with first and second contact-type conductive patterns and a non-contact-type conductive pattern, along with an elastic pattern conduction module that maintains or releases electrical connection between these patterns based on assembly or disassembly, and a detection circuit to identify any tampering attempts, including those using conductive liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a movable member is used to electrically connect conductive members through moving, then the case disassembling recognition portion can recognize assembly and disassembly, but the system becomes vulnerable to conductive liquid injection tampering
Solution Approach 1:
The conductive pattern is divided into multiple separate conductive members (first conductive member and second conductive member) that are arranged apart from each other. The movable member selectively connects these segmented conductive members during assembly, creating a multi-point verification system that prevents false recognition from conductive liquid injection.
Solution Approach 2:
The movable member acts as an intermediary that physically connects the first and second conductive members only when the case is properly assembled. This intermediary mechanism ensures that electrical connection occurs through a controlled mechanical interface rather than through potential conductive liquid pathways, adding a layer of physical verification.
2Reliability
If conductive liquid is injected into the tamper detect pattern, then the two separated conductive members are electrically connected, but the case disassembling recognition portion fails to recognize disassembly
Solution Approach 1:
The system performs preliminary verification by checking the electrical connection state of multiple conductive members before recognizing disassembly. The detection circuit verifies that the movable member has properly connected the conductive members through mechanical assembly, rather than relying solely on electrical continuity that could be forged by conductive liquid.
Solution Approach 2:
The detection circuit provides feedback by monitoring the electrical connection state between the first and second conductive members. When the movable member fails to connect these members properly (as in disassembly or tampering), the detection circuit generates a signal indicating unauthorized state, enabling the system to respond appropriately.
3Device complexity
If a simple switching method is used for case disassembly recognition, then the structure is simple, but the system can be confused by tampering methods
Solution Approach 1:
The recognition system is segmented into multiple conductive members arranged in a specific pattern, with the movable member serving as a selective connector. This segmentation transforms a simple switching mechanism into a multi-point verification system that maintains structural simplicity while significantly improving anti-tampering reliability.
Solution Approach 2:
The conductive members are arranged in a two-dimensional pattern on the printed circuit board rather than a simple linear sequence. This spatial arrangement adds a dimensional aspect to the switching mechanism, creating a pattern recognition system that can detect tampering while maintaining mechanical simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents data hacking by accurately detecting tampering attempts, even when conductive liquids are injected into the tamper detect pattern, ensuring the secure protection of important data.
Implementation Method 1
When the conductive liquid is injected into the tamper detect pattern, the two separated conductive members are electrically connected to each other through the conductive liquid.
Implementation Method 2
an elastic pattern conduction module that maintains or releases electrical connection between these patterns based on assembly or disassembly
Data Source
AI summary
Disclosed is a mobile terminal. The mobile terminal according to the present inventive concept, comprises: a case; a printed circuit board (PCB), which is arranged inside of the case, and on the surface of which is a temper detect pattern comprising first and second contact-type conductive patterns that are arranged adjacent to each other and a non-contact-type conductive pattern that is arranged apart from the first and second contact-type conductive patterns are provided; a detection circuit, which is electrically connected to the tamper detect pattern, for detecting whether the tamper detection pattern is conductive; and a pattern conduction module for controlling so that the first and second contact-type conductive patterns are conductive when the case is assembled, and the conduction of the first and second contact-type conductive patterns is released when the case is disassembled.