What are the security requirements for 'Remote Access' in OT compared to IT?

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Summary of Secure Remote Management Requirements for OT Sites

Global OT security frameworks such as NERC-CIP, NIST 800-82, and IEC 62443 provide strict guidelines to secure remote access to OT environments. Below is a detailed summary of their key requirements.

Key Security Requirements for Remote OT Management

FrameworkRequirements for Secure Remote Access
NERC-CIP (Critical Infrastructure Protection)
  • CIP-005 (Electronic Security Perimeter) – Remote access must pass through an Intermediate System (Jump Server).
  • Multi-Factor Authentication (MFA) is required.
  • Logging & Monitoring all remote sessions for auditing.
  • Only authorized personnel can establish remote connections.
NIST 800-82 (Guide to ICS Security)
  • Use VPNs & Encrypted Communication (TLS, IPsec) for all remote connections.
  • Role-Based Access Control (RBAC) – Limit access to specific functions.
  • Implement Network Segmentation to prevent direct access from IT to OT.
  • Audit Trails & Logging – All remote actions must be recorded.
IEC 62443 (Industrial Cybersecurity Standard)
  • IEC 62443-3-3: Secure Remote Access Management – Require strong authentication mechanisms.
  • Use of Secure Gateways – Remote sessions must go through a DMZ.
  • Session Timeouts & Auto-Disconnect for inactive connections.
  • Strict Change Management – No unauthorized remote updates.

Best Practices for Secure Remote OT Management

  • Use Secure Jump Servers – Prevent direct access to critical OT assets.
  • Implement MFA – Strong authentication for remote users.
  • Encrypt All Communications – TLS/IPsec VPNs for data protection.
  • Continuous Monitoring – Log and audit all remote access sessions.
  • Limit Privileges – Only allow the minimum necessary access.
  • Force Termination - Remote session termination if necessary.

#CPS #OT #XIoT #IoT #IIoT #IoMT #CPSSecurity #OTSecurity #IoTSecurity #CPS보안 #OT보안 #IoT보안

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