BLE Distance Measurement Man-in-the-Middle Attack Detection
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Solution Overview
Problem
Existing high accuracy distance measurement (HADM) systems using Bluetooth Low Energy (BLE) are vulnerable to Man in the Middle attacks, where attackers can manipulate packet signals to deceive devices about the distance, compromising security in applications like keyless entry systems.
Innovation Solution
A system that detects Man in the Middle attacks by comparing the output from a digitized model of the receive circuit with actual incoming packets, using a finite impulse response filter and attack metric calculator to determine a correlation score, allowing for accurate identification of attacks without duplicating transmit and receive circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Sounding Sequence is used for distance measurement, then measurement precision is improved, but vulnerability to Man in the Middle attacks increases
Solution Approach 1:
The patent creates a digitized model of the receive circuit in advance, before the actual signal reception. This model is used to generate an expected output that can be compared with the actual received signal, enabling detection of Man in the Middle attacks before they can successfully deceive the distance measurement system.
Solution Approach 2:
The patent creates a digitized copy (model) of the receive circuit that replicates its functionality. This copy is used to generate expected signal outputs without requiring physical duplication of the actual hardware circuits, enabling attack detection while avoiding the complexity of complete circuit duplication.
2Reliability
If complete duplication of transmit and receive circuits is performed for attack detection, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent creates a digitized model (copy) of the receive circuit that captures its essential functionality for signal processing. This digital model can be replicated and executed on processors without requiring physical duplication of the complex analog hardware circuits, thereby maintaining attack detection reliability while significantly reducing device complexity.
Solution Approach 2:
The patent replaces the physical hardware circuit duplication with a digital model executed on processors. Instead of duplicating the actual transmit and receive hardware circuits, the system uses software-based digitized models that replicate the circuit behavior, substituting mechanical/electrical systems with digital processing systems to reduce complexity.
Data Source
AI summary
A system that is capable of detecting a Man in the Middle attack is disclosed. The system includes a receive circuit for receiving incoming packets. The system also includes a digitized model of at least part of the receive circuit and optionally part of the transmit circuit. The system compares the output from the digitized model with the output from the read circuit to determine the likelihood of a Man in the Middle Attack. In certain embodiments, the digitized model is a finite impulse response filter with multiple taps. The system correctly identifies Man in the Middle attacks more than 90% of the time when the signal to noise ratio is greater than 20 dB.