Tamper Detection Enclosure Using Magnetoresistive Memory
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Solution Overview
Problem
Existing secure enclosures face challenges in detecting unauthorized access and data exposure due to the lack of effective tamper protection mechanisms, particularly in scenarios where encryption keys are vulnerable to attacks and data needs to be protected against extraction or interception.
Innovation Solution
A tamper-detecting enclosure arrangement utilizing magnetoresistive sensing memory storage cells with specific magnetic field characteristics, which change resistance states in response to changes in the magnetic field, allowing for intrusion detection and optional data erasure without the need for operating electrical power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption keys are stored in nonvolatile memory in secure enclosures, then data security is improved, but the enclosure becomes vulnerable to attacks and unauthorized access
Solution Approach 1:
The patent applies preliminary action by pre-setting the magnetoresistive memory cell to a first resistance state that indicates secure conditions before any potential intrusion occurs. The cell is initially configured to respond to magnetic field changes that would indicate tampering, allowing the system to detect and respond to threats before data can be compromised.
Solution Approach 2:
The patent introduces a magnetoresistive memory cell as an intermediary sensing element that mediates between the physical enclosure and the data security system. This cell acts as a sensor that translates physical intrusion (magnetic field changes) into detectable electrical state changes, providing an intermediate detection layer between the enclosure and the encrypted data.
2Reliability
If additional tamper detection apparatus is added to the enclosure, then intrusion detection capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the tamper detection function with the existing memory storage system by integrating a magnetoresistive memory cell that serves dual purposes: storing cryptographic data and detecting intrusions. This consolidation eliminates the need for separate detection apparatus, reducing overall device complexity while maintaining detection capability.
Solution Approach 2:
The magnetoresistive memory cell is designed with multi-functionality, serving both as a storage element for encryption keys and as a tamper detection sensor. This universal component performs multiple functions within a single element, avoiding the need for additional dedicated detection hardware and simplifying the overall system architecture.
3Measurement precision
If the magnetoresistive memory cell is positioned close to the protected item, then detection sensitivity is improved, but the magnetic field strength required increases
Solution Approach 1:
The patent applies local quality by positioning the magnetoresistive memory cell in close proximity to the protected item or enclosure opening, creating a localized sensitive detection zone. This strategic placement allows the cell to detect magnetic field changes specifically at the enclosure boundary where intrusions would occur, maximizing detection sensitivity without requiring strong magnetic fields throughout the entire system.
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
The solution provides reliable detection of unauthorized access and ensures that protected data remains secure by changing resistance states in response to magnetic field changes, effectively preventing data exposure and allowing for secure operation even without power.
Implementation Method 1
a magnetoresistive sensing memory storage cell positioned in or near the protected item in the enclosure having a magnetoresistance versus externally applied magnetic field characteristic
Data Source
Figure 1A~1C
Figure 2~4
Figure 5A~8
AI summary
A tamper detecting enclosure arrangement for enclosures (10) containing an interior space (11) in which a protected item (14) is positioned having a magnetoresistive sensing memory storage cell (16) positioned in or near the protected item (14) in the enclosure (10) having a two state offset magnetoresistance versus externally applied magnetic field. A magnet (13) is positioned at a selected separation distance from the magnetoresistive sensing memory storage cell (16) to thereby provide a magnetic field about the magnetoresistive sensing memory storage cell (16) if said enclosure (10) has not been opened in such a manner as to result in substantially increasing said separation distance.