Integrated Functional Safety and Security Diagnosis Mechanism of CPS Based on Blockchain

Ai Gu,Chuanyu Cui,Yue Li,Zhenyu Yin

doi:10.1109/access.2020.2967453

Abstract

This paper proposes a functional safety and information security protection mechanism based on blockchain technology. The design of the basic level and integration level blockchain structure of CPS distributed architecture and related functional safety and information security measures are introduced. An effective communication judgment mechanism based on functional safety error threshold is proposed, which is stored and judged by smart contract. And a refund transaction with a clock is proposed to ensure the effective execution of the functional safety error threshold mechanism. The article takes cyber physical machine tool system as an example to describe the SIL judgment method of CPS physical equipment and functional safety loop and combines SIL with fault diagnosis and risk protection. Finally, the rationality of our proposed mechanism is proved by information security, functional security, real-time and maintainability.

Highlights

The recent advances in our generation of industryIndustry 4.0 puts a spotlight on cyber-physical systems [1]
This paper proposes a safety and security protection mechanism based on blockchain technology, proposes a distributed architecture of cyber-physical systems (CPS), and designs the blockchain structure corresponding to each level of the architecture
Before the physical device accesses the CPS, it first authenticates its safety integrity levels (SIL) and stores its SIL in the corresponding block to assist in fault diagnosis and risk protection during the operation of the device

Summary

INTRODUCTION

The recent advances in our generation of industryIndustry 4.0 puts a spotlight on cyber-physical systems [1]. CPS often monitors the dimensions of the part in the physical world in real time and feeds them to the cyber world to be calculated and analyzed to obtain the machining steps, which is feed back to the numerical control systems in the physical world [5]. In this example, CPS can gather sensitive information about the dimensions of the parts as well as actuate changes to them. The main concerns of this work are as follows: (1) Introducing blockchain technology to solve the problem of information security and functional safety protection of CPS; (2) Proposing a safety protection mechanism of CPS and different levels of zones Block-chain design; (3) Applying block-chain technology to the safety research of Cyber physical machine tool system (CPMTS)

RELATED WORKS

SIL OF FUNCTIONAL LOOPS

SAFETY ANALYSIS AND DISCUSSION

CONCLUSION