PRODUCTS

nNetDiode
Hardware-enforced unidirectional data transfer solution
Implementing Zero Trust across two networks with different security levels
nNetDiode is Korea’s first CC-certified smart physical unidirectional data transfer security solution. By utilizing TX-only connected unidirectional transmit and receive boards, it blocks bidirectional data transfer between secure and non-secure networks, maintaining complete network isolation.

Security Functional
Certification

GS Certification

KC Certification

PPS
Preferred Product

Korean Patent

New Software Product Award
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Key Advantages
What Makes nNetDiode Unique
Korea’s Only Physically Enforced Unidirectional Hardware
Implements a physically enforced unidirectional data transfer system designed to eliminate remote cyber attack paths
Automatic Detection and Recovery of Unidirectional Transmission Errors and Faults
Applies proprietary technologies and algorithms protected by domestic and international patents
Extensive Domestic References and Support
for 200+ IT/OT Protocols
Backed by the largest number of domestic deployments, delivering extensive field-proven technical expertise
Deployment Scenarios
nNetDiode Deployment Areas
National guidelines such as the “National Cybersecurity Framework,” “Security Guidelines for Control Systems in Public Institutions,” and “Critical Information Infrastructure Vulnerability Assessment Standards” recommend deploying physical unidirectional gateways when connecting control networks and business networks to external networks, including the Internet.
  • Real-time monitoring of control network operations
  • Data collection from control system sensors
  • Maintain network isolation through one-way data transfer
Critical Infrastructure
(Nuclear, Power Generation, Energy, Water Resources, etc.)
  • One-way data transfer from external access control systems
  • One-way transmission of passenger information system data
Aviation and Rail
  • Collection of operational data from regional facilities
  • Integration with HMI-based control systems
  • Integration with centralized monitoring systems
Water and Wastewater Treatment Systems
nNetDiode Deployment Case 
Agency A (Affiliated with a Government Ministry) 
Implementation of a dual unidirectional gateway architecture for secure remote work environments
Agency A implemented a dual unidirectional gateway architecture based on nNetDiode, enabling secure large-scale remote work while maintaining strict network segmentation and eliminating unauthorized communication paths.
Challenges Before Deployment
 “Business operations needed to remain connected, but critical systems had to be more securely protected.”
– Security Lead, Agency A

Connections were necessary, but the method of connectivity posed significant risks:
  • Expansion of remote work increased access paths, leading to a broader attack surface
  • Stability requirements to support 20,000–40,000 concurrent users
  • Dilemma between enabling connectivity and maintaining network isolation
  • Risk of unauthorized or covert communication in TCP/IP-based bidirectional environments
  • 망Need to comply with policies and guidelines requiring unidirectional data transfer for network interconnection
Deployment Benefits
  • Dual Unidirectional Gateway Architecture
Minimizes reverse intrusion and bypass attack paths
  • Blocking Unauthorized Communication
Non-IP-based design structurally prevents unauthorized traffic
  • Stabilized Remote Work Environment
Ensures secure connectivity while maintaining network segmentation
  • Scalable for Large-Scale Access
Distributed L4 architecture with dual configuration ensures high availability
  • Enhanced Operational Visibility
Integrates operations and security monitoring into a unified workflow
Case
Summary
Agency A embraced the reality of remote work while implementing a dual unidirectional gateway architecture based on nNetDiode. This enabled the organization to simultaneously achieve network segmentation and block unauthorized communication.

 Connectivity was allowed—but unsafe connections were structurally impossible. This is the transformation enabled by nNetDiode.
Differentiators
Physically Enforced Unidirectional Hardware
Blocks reverse data flow at the physical level through one-way transmission
Automatic Retransmission on Data Errors
Selective retransmission of corrupted data ensures reliable delivery
Non-IP Encrypted Communication
Non-IP Encrypted Communication
Product Overview Video