Secure Transaction Card with Suspended Smartcard Chip
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Solution Overview
Problem
Current transaction cards with smartcard chips lack sufficient security measures to prevent unauthorized interrogation, as they can respond to radio frequency fields without user consent.
Innovation Solution
The design incorporates a layered structure with a smartcard chip and an electrically conductive coil, where the chip is suspended above coil contacts by standoff mechanisms such as springs or cantilever springs, requiring user intervention to establish electrical contact and enable communication, thereby ensuring that the card can only respond to a reader when pressed by the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the smartcard chip is directly connected to the coil, then the card can respond to radio frequency fields, but the card is vulnerable to unauthorized interrogation without user consent
Solution Approach 1:
The card is divided into distinct functional layers: a first layer containing the smartcard chip and a second layer containing the coil, separated by a dielectric layer. This segmentation physically isolates the chip from the coil until user activation, preventing unauthorized communication while maintaining functional separation.
Solution Approach 2:
A dielectric layer is introduced as an intermediary between the smartcard chip and the coil. This dielectric barrier prevents electrical connection and unauthorized RF communication, while still allowing the system to function when properly activated by the user through pressing the card.
2Reliability
If the smartcard chip is suspended above coil contacts by standoff mechanisms, then unauthorized access is prevented, but the device complexity increases
Solution Approach 1:
Multiple functional elements are merged into integrated layers: the smartcard chip, coil, dielectric layer, and standoff mechanisms are combined into a compact multi-layer structure. This merging reduces overall complexity compared to separate components while maintaining the security benefits of the suspended configuration.
Solution Approach 2:
The chip is positioned in a third dimension (vertically suspended) above the coil contacts rather than being laid out in a simple planar configuration. This vertical dimensionality allows for both security (preventing contact) and compact integration of multiple layers within a small footprint.
3Reliability
If the chip is pressed to make electrical contact with the coil, then user consent is required for communication, but the ease of operation is reduced
Solution Approach 1:
The card is pre-configured with the chip suspended above the coil contacts by standoff mechanisms, ready for activation. The preliminary positioning and structural preparation enable quick user activation through a simple pressing motion, rather than requiring complex setup or multiple steps during use.
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
This solution enhances security by ensuring that the smartcard chip can only communicate with a reader when the user intentionally activates it, preventing unauthorized access and increasing the card's security features.
Implementation Method 1
when the transaction card is in the presence of an interrogating radio frequency field, the transaction card receives power
Data Source
AI summary
A secure transaction card does not interact with an interrogating radio frequency field without user interaction. The user interaction may include pressing on the card to cause a smartcard chip to connect to a coil on the card. The user interaction may also include exposing the card to light, motion, touch, or the like. Control of the secure transaction card may be active or passive.