Key Fob Protection Device Using Wireless Reed Switch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing key fob protection methods, such as metal enclosures, are bulky and inconvenient, failing to effectively prevent relay attacks which exploit the limited range of inductive signals in passive access control systems.
Innovation Solution
A protection device is integrated into the key fob, comprising conductive layers, an insulator, and a wirelessly controllable reed switch, which can be activated or blocked to prevent communication, using communication modules for external control and distance-based switching to prevent unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal enclosure is used to block signals and prevent relay attacks, then security against relay attacks is improved, but the device becomes bulky and inconvenient
Solution Approach 1:
The patent extracts the signal-blocking function from a bulky metal enclosure and implements it through a thin-film多层 structure integrated directly into the key fob housing. This separates the shielding function from the structural housing, allowing effective signal blocking without increasing overall device volume.
Solution Approach 2:
The patent employs thin-film conductive and insulating layers deposited directly onto internal surfaces of the key fob. These thin films provide effective electromagnetic shielding and signal blocking while adding minimal thickness and maintaining a compact, convenient form factor.
2Ease of operation
If passive access control with inductive signals is used, then convenience for users is improved, but the system becomes vulnerable to relay attacks
Solution Approach 1:
The patent implements preliminary anti-action by pre-configuring the key fob with conductive and insulating thin-film layers that actively block inductive signals from relay devices. This preventive measure is built into the device structure itself, countering relay attacks before they can exploit the passive access control system.
Solution Approach 2:
The patent introduces an intermediary shielding structure between the key fob's communication module and external relay devices. The conductive and insulating thin-film layers act as intermediaries that allow legitimate communication while blocking malicious relay attack signals, thus mediating between convenience and security requirements.
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 a convenient and effective means to prevent relay attacks by wirelessly controlling the key fob's functionality based on proximity, ensuring secure access without the need for user intervention or bulky enclosures.
Implementation Method 1
a switch conductively coupled between the first conductive layer and the second conductive layer, the switch being wirelessly controllable to be in a conductive state or a blocking state. The switch may be a reed switch.
Implementation Method 2
The protective device may further comprise a first communication module connected to the switch. In such a case, the communication module is configured to receive signals to control the state of the switch.
Data Source
AI summary
It is provided a protection device for being provided inside a key fob to selectively inactivate the key fob. The protection device comprises: a first conductive layer; a second conductive layer; an insulator layer between the first conductive layer and the second conductive layer, the insulator layer preventing conductive contact between the first conductive layer and the second conductive layer; and a switch conductively coupled between the first conductive layer and the second conductive layer, the switch being wirelessly controllable to be in a conductive state or a blocking state.