Proximity Card Actuation Sensor for Unauthorized Data Interception
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Solution Overview
Problem
Current access control systems using proximity cards allow unauthorized interception of access information due to the ability for anyone within range to excite the electromagnetic field and copy data, compromising security.
Innovation Solution
A proximity card equipped with an actuation sensor and access electronics system that activates only in response to user input, preventing unauthorized communication of access information by remaining deactivated until an input is received from the actuation sensor, which processes and transmits data to the proximity card reader.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the proximity card is always active and ready for communication, then ease of operation is improved, but security is worsened due to unauthorized interception of access information
Solution Approach 1:
The proximity card transitions from a static always-active state to a dynamic state that can be activated or deactivated based on user input. The actuation sensor enables the card to change its operational state, moving between communication-ready and communication-blocked states, thereby resolving the contradiction between ease of operation and security.
Solution Approach 2:
The proximity card uses the user's own action (input to the actuation sensor) to control its activation state. The card serves itself by requiring deliberate user initiation to activate communication, preventing unauthorized access while maintaining convenience for legitimate users who intentionally activate the card.
2Object-affected harmful factors
If the proximity card requires activation via actuation sensor, then security is improved by preventing unauthorized interception, but device complexity increases due to additional sensor and control circuitry
Solution Approach 1:
The activation control function is extracted from the main card circuitry and implemented through a separate actuation sensor mechanism. This modular approach adds security functionality while keeping the complexity increase localized to the sensor and associated control circuits, rather than redesigning the entire card system.
Solution Approach 2:
The actuation sensor acts as an intermediary between the user and the card's communication function. It provides a simple interface (button, switch, or sensor input) that triggers the activation sequence, mediating between the user's intent and the card's security protocols without requiring complex user interaction.
3Object-affected harmful factors
If the proximity card remains inactive until activated, then security is improved, but loss of time occurs due to additional activation step required before access
Solution Approach 1:
The card remains in a pre-active state where it is physically present and ready, but communication is blocked until the actuation sensor is triggered. This preliminary state allows the card to be carried and positioned without consuming time for activation, while the actual communication activation happens only when needed, minimizing time loss.
Solution Approach 2:
The card alternates between inactive and active states based on user input rather than continuously maintaining communication. This periodic activation pattern ensures security by keeping the card inactive most of the time, while allowing quick activation only when the user intentionally needs access, thereby minimizing time loss compared to continuous operation.
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
Prevents unauthorized access by ensuring the proximity card remains inactive unless explicitly activated by the user, thereby securing access information from interception.
Implementation Method 1
The reader has a power supply which conveys a current to the reader resonant circuit causing the reader antenna to produce an excitation signal in the form of an electromagnetic field
Implementation Method 2
The excitation signal couples to the antenna of the proximally-positioned identification card through mutual inductance
Implementation Method 3
the card resonant circuit receives a current in response to the excitation signal which causes the card antenna to produce a response signal in the form of an electromagnetic field
Implementation Method 4
The response signal couples to the reader antenna through mutual inductance in substantially the same manner as described above with respect to coupling of the excitation signal to the card antenna
Data Source
AI summary
The present invention relates to access control systems using proximity cards, and in particular, to a proximity card and an associated method for controlling activation of the proximity card. The proximity card includes an actuation sensor and an access electronics system connected to the actuation sensor, the access electronics system configured to activate the proximity card in response to an input from the actuation sensor to enable communication of the access information from the proximity card.