Tire Pressure Monitoring Authentication via Pseudo-Random Markers
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Solution Overview
Problem
Current tire pressure monitoring systems lack security mechanisms, making them vulnerable to spoofing attacks where external entities can inject false messages, potentially leading to unsafe situations for drivers.
Innovation Solution
A method and system where the wheel unit encodes data packets with an authentication marker, and the receiver decodes them using a shared sequence of pseudo random numbers generated from a seed value, ensuring only valid data packets are processed, thus enhancing security by preventing spoofing attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no security mechanisms are implemented in the tire pressure monitoring system, then the system is simple and easy to operate, but it becomes vulnerable to spoofing attacks where external entities can inject false messages
Solution Approach 1:
The patent applies preliminary action by pre-establishing a shared secret between the wheel unit and the receiver before data transmission. This secret is used to generate authentication markers that are incorporated into the data packets in advance, allowing the receiver to verify the authenticity of incoming messages. This preliminary setup ensures data integrity before potential spoofing attacks can occur.
Solution Approach 2:
The patent introduces an authentication marker as an intermediary element that mediates between the transmitted data and the verification process. This authentication marker, generated using a shared secret, acts as a intermediary that proves the legitimacy of the data packet without revealing the secret itself, thus maintaining security while enabling verification.
2Reliability
If authentication markers are added to each data packet, then security against spoofing attacks is improved, but the data transmission complexity and processing requirements increase
Solution Approach 1:
The patent applies parameter changes by transforming the authentication mechanism from a complex cryptographic verification to a simpler comparison-based verification. The authentication marker is generated by applying a function to the shared secret and the data packet content, and the receiver simply needs to compare the received marker with its own calculation, reducing computational complexity while maintaining security.
Solution Approach 2:
The patent uses copying by having the receiver independently generate the same authentication marker that the wheel unit produces. Both parties use the same shared secret and the same algorithm to create identical authentication markers, allowing verification through comparison without requiring complex cryptographic operations or additional communication channels.
3Reliability
If a shared secret is used for generating authentication markers, then spoofing attacks are prevented, but the risk of the secret being compromised increases the security vulnerability
Solution Approach 1:
The patent applies local quality by making the authentication process specific to each data packet rather than using a static authentication key. The authentication marker is generated locally for each packet based on the shared secret and the packet's unique content, so that even if one packet's authentication is compromised, it does not affect the security of other packets.
Solution Approach 2:
The patent introduces dynamics by making the authentication marker change with each data packet. The authentication marker is dynamically generated based on the shared secret combined with packet-specific information such as sequence numbers or data content, ensuring that each packet has a unique authentication marker that cannot be reused or predicted, thus preventing replay attacks.
Data Source
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AI summary
The present invention relates to a method and a system for monitoring a parameter of a tire of a vehicle using a wheel unit (4a-4d) assigned to the tire, wherein the wheel unit is adapted to send data packets relating to the parameter of the tire to a vehicle based receiver (5). The method according to the invention comprises the steps of encoding (S2, S15) at least a part of each data packet with an authentication marker by the wheel unit and decoding (S5, S19) the encoded part of the data packets received at the receiver with an expected authentication marker. At the receiver it is verified (S6, S20) if the decoded data packets are valid.