Optical Communication Device Secure Resumption After Tapping
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Solution Overview
Problem
Existing techniques for preventing information leakage in optical communication networks, such as those using polarization state monitoring, are inadequate as they do not ensure secure resumption of optical signal transfer after detecting fiber tapping, potentially allowing interception before the polarization state returns to a predetermined standard.
Innovation Solution
A communication device and method that includes monitoring, control, and authentication means, where a dummy pattern signal is transmitted instead of actual data when a failure is detected, and only switched back to actual data after authentication confirms the removal of the interception device, ensuring secure resumption of data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical signal transfer is resumed immediately after failure detection, then communication efficiency is improved, but information security deteriorates due to potential interception
Solution Approach 1:
The system performs preliminary authentication of the optical fiber state before resuming actual data transmission. When a failure is detected and then cleared, the system enters an authentication phase where dummy patterns are transmitted and verified through polarization state monitoring and authentication calculations, ensuring the fiber has not been tapped before switching back to actual data mode
Solution Approach 2:
The system introduces an intermediary authentication mechanism between failure detection and data transmission resumption. The authentication unit acts as a mediator that verifies the safety of resuming transmission by monitoring polarization states and performing authentication calculations, allowing the system to balance security and efficiency
2Measurement precision
If polarization state monitoring is used to detect fiber tapping, then detection capability is improved, but response time deteriorates due to delay in determining whether polarization change exceeds predetermined standard
Solution Approach 1:
The system performs preliminary authentication calculations and polarization state monitoring in advance before actual data transmission resumes. By continuously monitoring polarization states and having authentication algorithms ready, the system can quickly determine when it is safe to resume transmission without waiting for polarization changes to exceed predetermined thresholds
Solution Approach 2:
The system rushes through the authentication process by using pre-configured authentication parameters and algorithms. When failure clearance is detected, the system immediately begins authentication with dummy patterns and polarization monitoring, skipping unnecessary delays and quickly transitioning to actual data transmission once authentication succeeds
Data Source
AI summary
A communication device configured to include a communication unit a monitoring unit, a control unit, and an authentication unit. The communication unit transmits and receives an optical signal to and from an opposed device via a transmission line. The monitoring unit monitors a transfer state of the transmitted optical signal. The control unit transmits a signal based on a dummy pattern instead of actual data when the monitoring unit detects that a failure occurs in transfer of the optical signal. The authentication unit authenticates start of transmission of a signal based on the actual data, when the monitoring unit detects elimination of the failure, while the signal based on the dummy pattern is being transmitted. Moreover, the control unit transmits the signal based on the actual data instead of the dummy pattern when the start of transmission is authenticated by the authentication unit.