Hardware One-Way Data Link with Severable Conductor for Secure Memory Erasure
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Solution Overview
Problem
Conventional network security devices, including firewalls and software-based one-way data transfer systems, fail to provide reliable protection against unauthorized data disclosure and reverse engineering, particularly in high-security environments like military command and control networks, where data transfer must be strictly unidirectional and non-bypassable.
Innovation Solution
A hardware-based interface device with integrated circuits and non-volatile memory that allows for selective and permanent erasure of program code and data transfer disabling upon user intervention, using a severable electrical conductor to prevent reverse engineering and unauthorized access, combined with a one-way data link ensuring unidirectional data flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If software-based one-way data transfer systems are used, then flexibility and ease of operation are improved, but reliability and security against reverse engineering deteriorate
Solution Approach 1:
The patent replaces software-based one-way data transfer systems with a hardware-based solution using a dual-diode optical isolator circuit. This hardware implementation physically enforces unidirectional data flow at the circuit level, eliminating the reliability issues associated with software-based approaches while maintaining operational simplicity through automatic hardware-controlled data transmission.
2Reliability
If hardware-based unidirectional interfaces are used, then reliability and non-bypassable operation are improved, but device complexity increases
Solution Approach 1:
The patent extracts the unidirectional data transfer function from a complex system and implements it through a simple dual-diode optical isolator circuit. This isolated circuit module provides reliable non-bypassable data flow control while minimizing overall device complexity by using only essential components: two diodes, an optical source, and an optical detector.
Solution Approach 2:
The patent introduces an optical intermediary (optical fiber or light beam) to transfer data between the low-security and high-security domains. This optical intermediary acts as a mediator that naturally enforces unidirectional communication through the dual-diode isolation mechanism, achieving reliable data transfer without complex electrical isolation circuits.
3Reliability
If conventional dual-diode approaches are used, then unidirectional data transfer is achieved, but vulnerability to reverse engineering through software processing remains
Solution Approach 1:
The patent replaces software-based data filtering algorithms with a pure hardware implementation using a dual-diode optical isolator circuit. This hardware solution physically prevents any data flow in the reverse direction and eliminates software code that could be reverse engineered, as the security mechanism operates at the physical circuit level without executable instructions.
Solution Approach 2:
The patent converts the potential harm of data leakage into a beneficial security feature by using the dual-diode circuit's inherent non-linearity. The circuit naturally blocks reverse data flow through its physical design, turning what could be a vulnerability into an unbreakable security barrier that cannot be reverse engineered.
4Reliability
If data transfer is strictly controlled, then security against unauthorized disclosure is improved, but ease of operation and flexibility deteriorate
Solution Approach 1:
The patent implements self-service security control where the dual-diode optical isolator circuit automatically enforces unidirectional data flow without requiring user intervention or complex configuration. The hardware circuit autonomously blocks reverse data flow and allows forward data transfer based on its physical design, providing strict security control while maintaining operational simplicity.
Data Source
AI summary
A communications device for ensuring secure data transfer provided having an interface device for controlling data transfer, an integrated circuit coupled to the interface device and having a processor, a non-volatile memory for storing at least program code for the processor, a volatile memory, an input pin and an output pin; and an electrical conductor which electrically connects the input pin and the output pin. The electrical conductor passes through an external portion of the enclosure, e.g., a slot, which allows a user to easily sever the electrical conductor. In operation, a portion of the program code detects when the electrical conductor is severed and causes the program code in the non-volatile memory to be erased, data transfer via the interface device to be disabled, and power to the integrated circuit cut off to ensure that all information in volatile memory is erased.