Movable NFC Shield for Relay Attack Prevention
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Solution Overview
Problem
NFC-enabled devices are vulnerable to relay attacks when turned off, as software protections are disabled, and existing electromagnetic shields do not effectively prevent communication when the device is in card emulation mode.
Innovation Solution
A shielding article with a movable shielding component that aligns with the NFC antenna to obstruct communication, while allowing other antennas like cellular or WiFi to remain operational, providing countermeasures against relay attacks without obstructing them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NFC card emulation mode is enabled when the device is turned off, then NFC capabilities can be used independently of other device features, but the device becomes vulnerable to relay attacks since software protections are rendered inoperable
Solution Approach 1:
A physical shield component is introduced as an intermediary between the NFC antenna and external electromagnetic fields. This shield acts as a mediator that can be positioned to block or permit NFC communication, providing a hardware-based control mechanism that operates independently of software protections. The shield serves as a physical intermediary that enables secure NFC operation when the device is powered off.
2Reliability
If a fixed electromagnetic shield is used to prevent NFC communication, then relay attacks are prevented, but other antennas such as cellular or WiFi are also obstructed
Solution Approach 1:
The shield component is designed to be movable rather than fixed, allowing it to be dynamically positioned. When the shield is in the first position, it blocks NFC antenna communication to prevent attacks. When moved to the second position, it permits NFC communication while leaving other antennas (cellular, WiFi) unobstructed. This dynamic positioning resolves the contradiction between security and functionality.
Solution Approach 2:
The shield is designed to selectively shield only the NFC antenna region while leaving other antenna regions accessible. By localizing the shielding effect to specific spatial zones corresponding to different antenna locations, the system can prevent NFC attacks without interfering with cellular or WiFi communications. This local quality approach allows different parts of the device to have different communication states simultaneously.
3Reliability
If software controls are used to protect the device from attacks, then security mechanisms are effective when the device is turned on, but these protections are rendered inoperable when the device is turned off
Solution Approach 1:
The patent replaces software-based security controls with a hardware-based mechanical shield system. Instead of relying on software controls that become inoperable when the device is powered off, a physical shield component provides hardware-level security that functions independently of the device's power state. This mechanical substitution ensures security mechanisms remain effective whether the device is on or off.
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 NFC communication when not desired, even when the device is off, while enabling normal operations by allowing other antennas to function, thus protecting the device from unauthorized transactions.
Implementation Method 1
a shielding component (42) capable of obstructing communication between an antenna (36) of the proximity-based communication device
Data Source
AI summary
A shielding article is provided, for shielding a device enabled for proximity-based communications, for example, NFC-enabled devices. The shielding article comprises a shielding component configured to prevent operation of an antenna of the device used for conducting proximity-based communications, without preventing operation of at least one other antenna of the device when the shielding component is aligned with the antenna used for conducting proximity-based communications. The shielding article may be separate from, or included in an accessory or carrying article and may be fixed or detachably coupled thereto.