Card Reader Firmware Control to Block Magnetic Strip Skimming
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Solution Overview
Problem
Existing card readers, including chip-based ones, are vulnerable to skimming attacks as they often read magnetic strip information, and existing hardware-based solutions are rendered ineffective by thieves modifying skimmer designs, necessitating costly and labor-intensive hardware upgrades.
Innovation Solution
A firmware-based solution that controls the card transport mechanism to prevent the magnetic strip from being read by the magnetic read interface while ensuring the chip is accessible, thereby preventing skimmers from obtaining card information without requiring hardware modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hardware-based solutions with sensors are added to detect skimmers, then skimmer detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical sensor-based detection systems with a software/firmware-based solution that controls the card transport mechanism. The firmware modifies the card handling behavior to prevent the magnetic strip from reaching the magnetic read interface, thereby preventing skimming without adding physical sensors or hardware components.
Solution Approach 2:
The patent extracts the skimmer protection function from the physical hardware and relocates it to the firmware/software layer. By removing the dependency on additional sensors and hardware components, the solution simplifies the device while maintaining security functionality.
2Adaptability or versatility
If chip-based card readers are designed to also read magnetic strips, then backward compatibility is improved, but vulnerability to skimming attacks increases
Solution Approach 1:
The patent introduces dynamic control of the card transport mechanism through firmware. The system can adapt its card handling behavior based on the transaction mode (chip-based vs. magnetic-based), allowing it to maintain compatibility while preventing skimming in chip-based transactions by stopping the card before the magnetic strip reaches the read interface.
Solution Approach 2:
The patent applies different card handling behaviors to different reading interfaces. The chip read interface can access card data without requiring the magnetic strip to be fully inserted, while the magnetic read interface requires the magnetic strip to be in contact with its read head. The firmware ensures that in chip-based transactions, the card is not transported far enough for the magnetic strip to be readable.
3Manufacturing precision
If motorized card transport is used to control card movement, then card handling precision is improved, but device complexity increases
Solution Approach 1:
The patent uses firmware control to manage the motorized card transport mechanism, replacing complex mechanical interlocks and physical constraints with software-based position control. The firmware instructs the transport mechanism to stop the card at a specific position that prevents the magnetic strip from reaching the magnetic read interface, simplifying the overall system while maintaining precision.
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 skimmers from reading magnetic strip data by ensuring the card's magnetic strip is never fully inserted into the magnetic read interface, while allowing chip-based transactions to proceed normally, all through software updates without the need for hardware modifications.
Implementation Method 1
controlling the motorized card transport to draw a leading edge of the card within the card reader to a distance sufficient to be read by the chip read interface but insufficient to be read by the magnetic read interface
Data Source
AI summary
A card reader's motorized transport is controlled by firmware of the reader so as to control a distance that any card can be pulled into the reader during a transaction on a host device. The distance is sufficient enough to allow an embedded chip on the card to be read by a chip read interface but is insufficient to be read by a magnetic read interface. Furthermore, the entire length of the card is prevented from completely passing over the magnetic read interface during the transaction such that any skimmer placed within the reader is physically unable to read the magnetic card information from the magnetic strip of the card. In an embodiment, the firmware is configured to permit only chips from the cards to be read for transactions or configured to turn off chip only reading by permitting both chip reads and magnetic strip reads for each transaction.