Transceiver Propagation Delay Determination with Cryptographic Signatures
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Solution Overview
Problem
Existing methods for determining propagation delay and distance between transceivers in vehicle entry and starting systems are susceptible to manipulation and lack reliability and efficiency.
Innovation Solution
The method involves generating codes, preambles, and signatures using a calculation method known to the transceivers, which are then used in messages to determine propagation delay and distance, incorporating additional keys for enhanced security and reliability, and filtering messages based on these codes and values to prevent manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods are used to determine propagation delay and distance, then the system can operate, but the determination is susceptible to manipulation and lacks reliability
Solution Approach 1:
The system generates codes, preambles, and signatures in advance using a calculation method known to the transceivers. These pre-generated authentication elements are incorporated into messages before transmission, allowing the receiving transceiver to verify the authenticity of distance determination data before processing, thus preventing manipulation attacks
Solution Approach 2:
The patent introduces cryptographic codes, preambles, and signatures as intermediary elements that mediate between the transmitting and receiving transceivers. These intermediaries carry authentication information that enables the receiving transceiver to verify whether the distance determination data has been manipulated, adding a layer of security without altering the fundamental distance measurement process
2Reliability
If cryptographic codes and signatures are generated and used in messages, then security and reliability are enhanced, but the complexity of the system increases
Solution Approach 1:
The calculation method used to generate codes, preambles, and signatures is known to both transmitting and receiving transceivers. This universal knowledge base allows both devices to perform the same cryptographic operations independently, eliminating the need for complex key distribution infrastructure and simplifying the overall system architecture while maintaining security
Solution Approach 2:
Each transceiver generates and verifies cryptographic elements using its own processing capabilities and the shared calculation method. The system is self-sufficient, with each device performing its own authentication operations without requiring external cryptographic infrastructure or complex inter-device key management, thereby reducing overall system complexity
Data Source
AI summary
A method and apparatus for determining a propagation delay and/or a distance between a plurality of transceivers, in particular between transceivers outside and/or as part of a motor vehicle, wherein the transceivers are each designed: to generate identical codes in a plurality of these transceivers, using a calculation method known to them, from at least one starting value transmitted, in particular, from one of the transceivers to the further transceivers, to transmit one or more messages from at least one of the transceivers to one or more further ones of the transceivers, which messages each contain at least one of the codes, to determine at least one propagation delay and/or at least one distance between at least two of the transceivers, in particular from the propagation delay and/or transmission times of the one or more messages.