BLE Bridge Packet Decryption for Secure HART Process Data
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Solution Overview
Problem
Industrial communication protocols like HART and BLE are not compatible, leading to challenges in interoperability and security in process control environments, where secure and efficient data transmission between field devices and remote devices is necessary.
Innovation Solution
A method and apparatus that use a BLE bridge to transmit process data from field devices to remote devices, involving encryption and authentication of data packets using a nonce value and encryption key, ensuring only authorized devices can access the data, and eliminating the need for additional hardware or complex maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If industrial communication protocols (HART) and wireless protocols (BLE) are used separately for field devices and remote devices, then protocol compatibility and interoperability are maintained within each protocol domain, but communication between different protocol domains becomes impossible without additional compatibility layers
Solution Approach 1:
The patent implements a gateway device that serves as an intermediary between HART field devices and BLE remote devices. The gateway receives data packets from HART field devices, translates the protocol format, and transmits translated packets to BLE remote devices. This mediator approach enables cross-protocol communication while maintaining the integrity and simplicity of each original protocol domain.
2Adaptability or versatility
If data transmission is enabled between field devices and remote devices using different protocols, then interoperability is achieved, but security risks increase due to protocol mismatches and unauthorized access potential
Solution Approach 1:
The patent implements preliminary security actions by establishing encryption key pairs and authentication mechanisms before data transmission begins. The gateway device and remote devices perform mutual authentication and establish secure communication channels in advance. Data packets are encrypted using pre-shared keys, and authentication tokens are verified before allowing communication, preventing unauthorized access and protocol exploitation.
3Reliability
If encryption and authentication mechanisms are implemented for secure data transmission, then security and data protection are enhanced, but processing overhead and transmission complexity increase
Solution Approach 1:
The patent segments the security processing into distinct modular components: authentication module, encryption module, and packet formatting module. Each security function is handled by a separate module within the gateway device, allowing independent optimization and maintenance. This segmentation reduces processing complexity by organizing security operations into manageable, reusable components rather than monolithic processing logic.
4Reliability
If traditional industrial communication systems are used without protocol translation, then system reliability is maintained within the industrial domain, but adaptability to wireless and mobile devices is lost
Solution Approach 1:
The gateway device acts as a reliable intermediary that preserves industrial communication reliability while enabling wireless adaptability. It maintains HART protocol integrity for field device communications and simultaneously provides BLE protocol support for wireless device connectivity, bridging the reliability of industrial systems with the adaptability of wireless technology.
Data Source
AI summary
An example method to obtain process data associated with a process control system received from a field device includes identifying, at a computing device, associated data and a payload included in the data packet, the associated data including a source bit, determining, at the computing device, a type of connection between the field device and the computing device based on the source bit, determining, at the computing device, an encryption key identifier and an initialization vector based on an auxiliary data packet received prior to the data packet, generating, at the computing device, a nonce value based on the source bit and the initialization vector, the nonce value indicative of an input to a data encryption algorithm used by the field device to encrypt the payload, and extracting, at the computing device, the process data associated with the process control system from the payload.