Secure Microwave Barrier Encryption

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Solution Overview

Problem

Microwave barriers face limitations such as the potential for transmitter device cloning and tampering, which can compromise security and increase costs due to the need for additional communication links for monitoring.

Innovation Solution

The implementation of an encrypted data transmission system using AES encryption algorithms in Counter with CBC-MAC or Galois/Counter Mode, incorporating a unique nonce and message counter, along with physical anti-tampering devices in both transmitter and receiver devices, ensures authentication and integrity of the microwave beam, preventing cloning and tampering without additional communication links.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a transmitting device is used for microwave barrier, then intrusion detection is enabled, but the device can be cloned by a rogue transmitter

Engineering Contradiction:
ImprovesecurityVSAvoidencryption system
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses cryptographic copying where the transmitter's identity and authentication data are replicated in the receiver's memory during a pairing process. This allows the receiver to verify the transmitter's authenticity without physical presence, preventing rogue transmitters from impersonating authorized devices while maintaining system security.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The patent introduces cryptographic authentication data as an intermediary between the transmitter and receiver. This authentication mechanism mediates the verification process, allowing the receiver to confirm the transmitter's identity through encrypted challenge-response protocols without requiring direct physical interaction or additional communication infrastructure.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If tamper monitoring is achieved via a tamper switch with independent communication link, then tampering detection is enabled, but additional costs and energy consumption are incurred

Engineering Contradiction:
Improvetamper detectionVSAvoidenergy consumption
Core Design Contradiction:
ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent merges the tamper detection function with the existing microwave communication link. The authentication data is stored in secure memory that automatically detects tampering attempts, and this detection is communicated through the same encrypted microwave channel used for normal operation, eliminating the need for separate communication infrastructure and reducing energy consumption.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The patent makes the microwave communication link multi-functional by using it for both intrusion detection and tamper monitoring. The authentication protocol serves dual purposes: verifying transmitter identity and detecting receiver tampering, thereby consolidating multiple security functions into a single communication channel and reducing overall system complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentEP3836102B1Secure microwave barrier
Publication Date: 2022.09.07 ERYMA
  • EP3836102B1 patent drawingFigure 1a
  • EP3836102B1 patent drawingFigure 1b
  • EP3836102B1 patent drawingFigure 2a

AI summary

A transmitting device (100) implements a microwave barrier, the transmitting device comprising: an encryption circuit (110) configured to: store an encryption key (305A) and a unique digital identifier (301) of the transmitting device; obtain a data frame (300A) comprising the unique digital identifier (301) of the transmitting device and a state information (302) of the transmitting device and encrypt the data frame (300A) using the encryption key (305A) so as to generate an encrypted data frame (311); a modulator (120) for modulating a microwave signal in order to generate a modulated microwave signal covering an intrusion detection volume and comprising a subcarrier encoding a message (310) comprising the encrypted data frame (311) using an encryption algorithm to obtain replay protection.A receiving device (200) receives the modulated microwave signal from the transmitting device, extracts the encrypted data frame (311), and decrypts the encrypted data frame (311) to generate a decrypted data frame (300B). Authentication of the transmitting device is performed using the decrypted data frame (300B) and a digital signature (301) stored in the decryption circuit of the receiving device.