One-Way Optical Network Interface Card for Secure Data Transfer
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Solution Overview
Problem
Existing hardware-enforced one-way information flow control devices are unreliable, slow, and expensive, and often rely on custom ICs or FPGAs, making them impractical for high-security applications like nuclear power plants.
Innovation Solution
A hardware-enforced one-way information flow control system using a pair of optical network interface cards connected by a split optical fiber, which ensures secure, high-throughput, and low-latency data transfer without backward flow or electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hardware-enforced one-way flow control is implemented using custom ICs or FPGAs, then security is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by using standard, commercially available optical network interface cards instead of custom ICs or FPGAs. These standard NICs can be used in various network configurations while maintaining the one-way flow control function, thereby reducing device complexity and cost without compromising security.
Solution Approach 2:
The patent uses optical copying where data is converted to optical signals transmitted through fiber optic cables. This optical copy mechanism enables one-way data transmission where the data can be transmitted forward but cannot be retrieved or sent backward, achieving security through the physical nature of optical transmission rather than complex hardware enforcement.
2Reliability
If conventional hardware-enforced one-way flow control is implemented, then security is improved, but data transfer speed deteriorates
Solution Approach 1:
The patent replaces mechanical/electrical signal transmission with optical signal transmission. By using optical network interface cards and fiber optic cables, data transfer occurs at the speed of light rather than electrical signal speeds, dramatically increasing data transfer speed while maintaining the security benefits of hardware-enforced one-way flow control.
3Device complexity
If software-based information flow control is implemented, then device complexity is reduced, but security deteriorates due to software vulnerabilities
Solution Approach 1:
The patent introduces an optical intermediary layer between networks. Data is converted to optical signals that travel through fiber optic cables, creating a physical barrier that software attacks cannot penetrate. This optical mediator maintains security while allowing data transmission, avoiding the vulnerabilities of pure software-based control.
4Productivity
If Network Pump is used for one-way flow control, then information flow is enabled, but reliability deteriorates due to reverse flow acknowledgements
Solution Approach 1:
The patent extracts and removes the problematic reverse flow acknowledgement mechanism from the system. By using purely optical transmission without electrical return paths, the system eliminates any possibility of reverse information flow, ensuring pure one-way communication while maintaining productivity through efficient optical data transmission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides reliable, high-speed one-way information flow with inherent simplicity and security, eliminating the need for custom hardware and reducing costs while maintaining network isolation and integrity.
Implementation Method 1
transmitted as optical signals to an optical transceiver on the receiving side
Implementation Method 2
an optical transceiver on the receiving side receives the optical signals and routes the information to the receiving computer platform
Data Source
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AI summary
An information flow control device has: a first network interface card on a transmission side, the first network interface card including first and second transceivers, each of the first and second transceivers having a transmit port and a receive port; and a second network interface card on a receiving side, the second network interface card including at least one receive port. A first data connection segment connects the first transceiver transmit port to the second transceiver receive port, a second data connection segment connects the second transceiver transmit port to the first transceiver receive port, and a third data connection segment connects the first transceiver transmit port to the receive port of the second network interface card. Interconnection of the first and second transceivers provides continuity while connection of the first transceiver transmit port and the receive port of the second network interface card enables hardware-enforced one-way data transfer.