UWB Ranging Frame Encryption for Secure STS Variation
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Solution Overview
Problem
The existing UWB ranging technology faces a security risk due to the use of identical scrambled timestamp sequences (STS) in each ranging round, which compromises the security of the communication process.
Innovation Solution
Implement a method where devices use different encryption parameters for each ranging frame by generating and updating ranging encryption parameters based on a common configuration and key derivation algorithm, ensuring unique encryption for each frame, thereby enhancing security without establishing a communication link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If identical scrambled timestamp sequences (STS) are used in each ranging round, then ranging efficiency is maintained, but security is compromised
Solution Approach 1:
The patent applies preliminary action by pre-establishing a shared secret between devices before the ranging process. This secret is used to derive unique encryption parameters for each ranging frame in advance, eliminating the need for complex real-time parameter negotiation while ensuring security. The encryption parameters are prepared beforehand through a key derivation function that generates frame-specific keys from the pre-shared secret and frame counter.
Solution Approach 2:
The patent implements dynamics by making encryption parameters dynamic and frame-specific rather than static and identical across all frames. Each ranging frame uses a unique encryption parameter derived from the frame counter, ensuring that even though the base secret remains the same, the actual encryption keys change with each frame. This dynamic approach prevents replay attacks while maintaining efficient parameter management.
2Reliability
If different encryption parameters are used for each ranging frame, then security is enhanced, but operating time and power consumption increase
Solution Approach 1:
The patent applies self-service by enabling each device to independently generate its encryption parameters using the pre-shared secret and frame counter without requiring communication or coordination with the other device. This self-service mechanism eliminates the need for additional message exchanges to synchronize encryption parameters, thereby reducing operating time and power consumption while maintaining strong security through frame-specific encryption.
3Reliability
If different encryption parameters are used for each ranging frame, then security is enhanced, but communication complexity increases
Solution Approach 1:
The patent extracts the complex parameter synchronization problem by separating the security-critical secret sharing from the frame-specific parameter generation. The pre-shared secret is extracted and stored securely, while the frame counter and key derivation function are used to generate individual frame parameters without requiring exchange or synchronization between devices. This extraction approach simplifies the overall system by eliminating the need for complex parameter negotiation protocols.
Data Source
AI summary
This application provides a ranging method and apparatus. In the method, when ranging is performed between a first device and a second device, each ranging frame in one ranging round is determined based on different ranging encryption parameters, so that ranging frames generated in the ranging round are different from each other. In other words, the first device and the second device use different encryption parameters to encrypt and decrypt different ranging frames. This ensures that each ranging frame has a unique encryption parameter in a ranging process, so that secure ranging performance can be effectively improved.