Passive Keyless Entry Receiver Signal Authentication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless passive keyless entry systems are vulnerable to relay attacks, where attackers use proxy devices to intercept and relay secret codes, compromising security by tricking the system into granting unauthorized access.
Innovation Solution
A passive keyless entry receiver system that measures RSSI power level differences at specific points in a data packet's payload, storing peak RSSI levels in registers to determine if they match an expected sequence, thereby authenticating the signal and reducing power consumption by activating the application controller only after the entire payload is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the application controller is activated continuously to authenticate signals in real-time, then security against relay attacks is improved, but power consumption increases
Solution Approach 1:
The receiver measures and stores peak RSSI levels at specific points in the data packet payload during the reception process, before the application controller is activated. This preliminary measurement and storage of signal strength data allows the application controller to perform authentication efficiently after activation, without requiring continuous monitoring during the entire reception process.
Solution Approach 2:
The receiver system performs self-service by automatically measuring and storing peak RSSI levels in registers during payload reception, and by activating the application controller only when needed for authentication. This reduces the need for continuous external control and minimizes power consumption while maintaining security functionality.
2Reliability
If peak RSSI levels are measured and stored at specific points in the payload, then relay attack detection is improved, but device complexity increases
Solution Approach 1:
The payload is divided into specific segments or time points where peak RSSI levels are measured and stored in separate registers. This segmentation allows the system to focus authentication efforts on critical portions of the data packet, improving relay attack detection while maintaining manageable device complexity through structured organization of measurement points.
Solution Approach 2:
Registers serve as intermediary storage elements between the RSSI measurement function and the application controller. The registers hold peak RSSI level data, allowing the application controller to authenticate signals without direct real-time access to the measurement process, thereby simplifying the overall device architecture while enabling sophisticated authentication.
3Use of energy by moving object
If the application controller is activated only after the entire payload is received, then power consumption is reduced, but authentication response time increases
Solution Approach 1:
While the receiver is actively receiving the payload and measuring RSSI levels, the system prepares authentication data by storing peak RSSI levels in registers. This preliminary preparation of authentication data during the reception phase means that when the application controller is activated after payload reception, the authentication process can proceed quickly using pre-prepared data, minimizing the actual authentication response time.
Data Source
AI summary
Embodiments related to transmission of data packets are described and depicted.