WAIC Baseband Hardware Encryption via Cross Logical Operations

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Solution Overview

Problem

Existing WAIC technology faces challenges in securely transmitting and receiving data between avionics subsystems and cockpit systems, particularly in avoiding unintended data access and ensuring secure communication within the 4.2 GHz to 4.4 GHz frequency spectrum.

Innovation Solution

A hardware-based encryption and decryption system utilizing a wireless transceiver baseband hardware that performs mixed logical operations such as XOR and XNOR on data bytes, packetizes key coefficients with encrypted data, and uses on-chip memory for secure key storage and access, making data difficult to intercept.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If software encryption is used for WAIC data transmission, then implementation flexibility is improved, but security against interception deteriorates

Engineering Contradiction:

Improveimplementation flexibilityVSAvoidsecurity against interception

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces software-based encryption with hardware-based encryption implemented in the baseband processor. This substitution of the encryption mechanism from software to hardware layer provides both the flexibility needed for WAIC implementation and the enhanced security required to prevent interception, as hardware encryption is inherently more resistant to software-level attacks and unauthorized access.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If hardware encryption is used for WAIC data transmission, then security against interception is improved, but device complexity deteriorates

Engineering Contradiction:

Improvesecurity against interceptionVSAvoidbaseband hardware complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the encryption functionality directly into the baseband processor hardware, combining what would traditionally be separate encryption hardware with the existing communication processing unit. This integration approach provides hardware-level security while avoiding the additional complexity of completely separate encryption devices, as the encryption operations are performed within the same processing architecture that handles the WAIC data transmission.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If encryption operations are performed in software, then ease of implementation is improved, but execution speed deteriorates

Engineering Contradiction:

Improveease of implementationVSAvoidexecution speed

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent substitutes software-based encryption operations with hardware-based encryption operations executed by the baseband processor. This replacement moves the encryption function from the software execution layer to the hardware execution layer, providing both ease of implementation through integrated hardware design and high execution speed through dedicated hardware processing circuits that can perform encryption operations in parallel with data transmission processing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentEP3691176B1Protective approach for WAIC baseband signal transmission

Publication Date: 2023.09.06 ROSEMOUNT AEROSPACE INC

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AI summary

A transceiver baseband hardware is provided. The transceiver baseband hardware includes a baseband hardware (121). The baseband hardware includes an encryption-decryption block (123). The encryption-decryption block encrypts intended transmission data and decrypts encrypted data with key coefficients via a cross logical operation of the encryption-decryption block. The cross logical operation includes when lower significant bytes of the key coefficients operating on most significant bytes of the intended transmission data and the encrypted data.