NFC Frame Modification for Secure Contactless Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Near Field Communication (NFC) systems face issues with security, as they are vulnerable to eavesdropping and replay attacks, and the presence of multiple tags can increase energy consumption and reduce communication distance, especially in low-cost applications where advanced encryption is not justified.
Innovation Solution
Modifying specific elements of NFC frames, such as the start of frame, end of frame, or error check fields, using predefined modification rules stored in both devices, allowing only authorized devices to process these modified frames, thereby preventing unauthorized access and reducing energy consumption by ensuring only intended frames are processed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NFC frames use a well-defined standard format for interoperability, then device compatibility is improved, but security is worsened because all devices can receive and decode frames making them vulnerable to eavesdropping and replay attacks
Solution Approach 1:
The patent applies local quality by modifying specific local elements within the NFC frame structure (such as the start of frame field, end of frame field, or payload field) while keeping the overall frame format standardized. This allows authorized devices with modification rules to distinguish and process only intended frames, enhancing security at the local frame element level while maintaining global interoperability through the standard frame structure.
2Adaptability or versatility
If multiple tags are present in the communication area, then system versatility is improved, but energy consumption increases and communication distance decreases
Solution Approach 1:
The patent applies preliminary action by modifying frame elements in advance using predefined modification rules before transmission. This allows the receiving device to quickly identify and filter intended frames during the initial reception phase, reducing the need for prolonged processing and energy consumption when multiple tags are present, thereby extending effective communication distance.
3Reliability
If advanced encryption is implemented to prevent eavesdropping and replay attacks, then security is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by modifying specific parameters of NFC frame elements (such as altering the start of frame field, end of frame field, or payload field content) using predefined modification rules. This provides a lightweight security mechanism that prevents unauthorized devices from processing intended frames without requiring complex encryption algorithms, thereby maintaining low device complexity and cost for low-cost applications.
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 approach enhances security by preventing replay attacks and improving communication range by ensuring only intended devices can interpret modified frames, reducing the need for costly encryption and maintaining interoperability while conserving energy.
Implementation Method 1
When transmitting information between a reader and a device, the reader generates a magnetic field via its antenna which is, generally in the standards conventionally used, a sine wave (the carrier) at 13.56 MHz
Implementation Method 2
The device antenna then modulates the field generated by the reader, according to the information to be transmitted. This modulation is performed by modifying the load connected to the terminals of the device antenna
Implementation Method 3
The device comprises a processor configured to demodulate the received carrier in order to obtain the data transmitted from the reader
Data Source
AI summary
The disclosure relates to a modified NFC framing is used by a reader and selected devices during at least a part of the communication between the reader and the selected devices. The reader and the selected devices store modification rules for modifying the frames. Devices not storing those modification rules will discard the received modified frames.