Data Diode Unidirectional Communication via SDN Flow Rules
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Solution Overview
Problem
Industrial networks face challenges in efficient, reliable, and secure communication due to the complexity of assets with different software and hardware configurations, making them vulnerable to cyber threats and operational disruptions.
Innovation Solution
Implementing a data diode for unidirectional communication between distinct networks using Software-Defined Networking (SDN) and Network Function Virtualization (NFV), which acts as a unidirectional gateway to restrict data flow and enhance security by segregating networks, thereby preventing reverse data flow and mitigating cybersecurity risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bidirectional communication is implemented between networks, then data exchange flexibility is improved, but cybersecurity vulnerability increases
Solution Approach 1:
The system segments network communication into unidirectional data diodes that separate data flow directions, allowing flexible data exchange from industrial to IT networks while preventing reverse communication that would create security vulnerabilities
Solution Approach 2:
The data diode acts as an intermediary device between industrial and IT networks, enabling controlled data transfer while blocking harmful reverse communication, thus resolving the contradiction between flexibility and security
2Reliability
If network segmentation is implemented, then security is improved, but communication efficiency deteriorates
Solution Approach 1:
The data diode is pre-configured with flow rules and classification parameters before operation, enabling automatic and efficient data packet filtering and routing without real-time processing delays, thus maintaining both security and communication efficiency
3Reliability
If data diode with flow rules is implemented, then data security is improved, but device complexity increases
Solution Approach 1:
The system manages complexity by parameterizing flow rules and classification criteria, allowing flexible security policy configuration without increasing fundamental system complexity, enabling easy adaptation to different security requirements
Data Source
AI summary
Various embodiments described herein relate to providing unidirectional communication of data via a data diode between distinct networks. In an embodiment, an operational technology (OT) data packet associated with one or more asset devices connected to a first network with a first classification is received. Additionally, one or more attributes of the OT data packet are compared to a set of flow rules associated with a flow table for a network switch of the first network. Based at least in part on whether a match is identified between the one or more attributes of the OT data packet and at least one flow rule of the set of flow rules, the OT data packet is transmitted to a second network associated with a second classification.