Radio Identification Close-Range Check Relay Attack Prevention
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Solution Overview
Problem
Radio identification systems are vulnerable to relay attacks due to the lack of a physical presence check, particularly in passive entry systems where transponders can be activated wirelessly and data transmitted over long distances without manual intervention, compromising security.
Innovation Solution
Implementing an additional close-range check using a close-range status signal, such as a magnetic field, to ensure data transmission only occurs when the transponder is within proximity of the reader, with features like a predefined time window, coded signals, and variable polarization to enhance security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless activation and data transmission are enabled for passive entry systems, then user convenience is improved, but security against relay attacks deteriorates
Solution Approach 1:
The patent introduces a close-range status signal as an intermediary verification mechanism between the reader and transponder. This mediator verifies physical proximity through a separate communication channel (e.g., magnetic field, acoustic signal, or optical signal) before allowing data transmission, thus preventing relay attacks while maintaining convenient wireless operation
Solution Approach 2:
The system performs a close-range check using a status signal before enabling data transmission. This preliminary verification of physical proximity ensures that only transponders in close physical vicinity can be activated and read, preventing premature or remote activation that would enable relay attacks
2Reliability
If transmission range is limited to short distances, then security is improved, but system functionality deteriorates due to relay station extension
Solution Approach 1:
The patent adds a spatial dimension verification by using a close-range status signal that can only be detected when the transponder is in immediate physical proximity to the reader. This creates a second layer of spatial verification beyond the radio frequency transmission range, effectively nullifying relay stations that attempt to extend the communication distance
3Reliability
If manual activation is required for transponder, then security is improved, but user convenience deteriorates
Solution Approach 1:
The system provides automatic wireless activation with feedback verification. The reader automatically activates the transponder when a close-range status signal is detected, and the transponder responds by transmitting its data. This feedback loop confirms successful activation and data reception, providing both security verification and user convenience without manual intervention
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 significantly enhances security by preventing relay attacks and ensuring data transmission only in close proximity, maintaining user convenience while providing robust protection against misuse.
Implementation Method 1
provision of a close-range status signal which indicates the close range of the reader
Data Source
AI summary
The invention relates to a method and a system for radio identification with an additional close-range check, which prevent misuse of a radio identification system and increase the security of radio identification. In particular, so-called relay attacks are to be largely prevented in passive entry systems. The method according to the invention firstly provides for activation of a transponder (S1) for reading of its data. After this step, an additional close-range status signal is provided (S2) which indicates the close range of a reader. Once the close-range status signal has been detected by a transponder (S3), data transmission for reading of the data stored in the transponder by the reader is possibly enabled in reaction to the detection of the close-range status signal (S4) and the data can be read by the reader for identification of the transponder (S5). The system according to the invention for radio identification with an additional close-range check consists of a reader for reading the data stored in a transponder and of an evaluation unit which is connected to the reader for identifying the transponder on the basis of the read data.