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A Three-Stage Dynamic Assessment Framework for Industrial Control System Security Based on a Method of W-HMM.

Xudong Ji1, Hongxing Wei1, Youdong Chen1

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This study introduces a dynamic assessment framework for industrial control system security (DAF-ICSS) using machine learning. It enhances security evaluation for industrial robots, offering timely and accurate insights into system vulnerabilities.

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dynamic assessmentindustrial control systemssecurityweighted hidden Markov model

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Area of Science:

  • Cybersecurity
  • Industrial Control Systems (ICS)
  • Machine Learning

Background:

  • Industrial control systems face increasing cyberattack risks due to cloud computing and AI.
  • Dynamic security assessment is crucial for protecting corporate capital during ICS operations.
  • Existing methods may not adequately address the evolving threat landscape in ICS.

Purpose of the Study:

  • To propose a novel dynamic assessment framework for industrial control system security (DAF-ICSS).
  • To enhance the security assessment of industrial systems, using an industrial robot as a case study.
  • To provide a timely and intuitive reflection of system security states.

Main Methods:

  • Developed a machine learning-based framework (DAF-ICSS) with static identification, dynamic monitoring, and security assessment phases.
  • Utilized a weighted Hidden Markov Model (W-HMM) with the Baum-Welch algorithm for dynamic security modeling.
  • Compared DAF-ICSS with two existing methods for assessing industrial robot security.

Main Results:

  • DAF-ICSS demonstrated more accurate security assessments compared to traditional methods.
  • The framework provides timely and intuitive insights into the system's security status.
  • Effectively analyzes security impacts from unknown ICS attack types by inferring security states.

Conclusions:

  • The proposed DAF-ICSS offers a robust and accurate approach to dynamic industrial control system security assessment.
  • The framework's ability to handle novel threats makes it valuable for modern cybersecurity challenges.
  • DAF-ICSS provides a significant advancement in securing critical industrial infrastructure.