Quantum Key Distribution Route Selection for Global Key Availability
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Solution Overview
Problem
Conventional quantum cryptographic communication systems fail to guarantee the expected quality of service (QoS) due to uncertainties in local key generation and storage, which can lead to insufficient global key availability for secure data transmission.
Innovation Solution
A quantum cryptographic communication control device with a collection, calculation, guarantee, and selection unit that collects link information, calculates link costs, and selects optimal routes for global key distribution to ensure the required local key amounts are maintained, thereby ensuring the quality of service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum key distribution is used for cryptographic communication, then security is improved, but key availability becomes uncertain due to local key generation and storage limitations
Solution Approach 1:
The system performs preliminary actions by collecting link information and calculating link costs before key distribution, establishing optimal routes in advance to ensure key availability. The control device proactively manages key distribution paths rather than reactively responding to key exhaustion.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring link information and key usage status, then adjusting route selections based on this feedback. The control device uses collected link information to dynamically calculate link costs and select optimal routes, creating a closed-loop control system that adapts to changing conditions.
2Reliability
If global key distribution is optimized for security, then cryptographic capacity is improved, but service quality guarantee becomes difficult due to key management complexity
Solution Approach 1:
The control device acts as an intermediary between key distribution and application usage, managing the complexity of key routing centrally. This intermediary function allows automated route selection based on link costs without requiring complex distributed key management across all network nodes.
Solution Approach 2:
The system uses parameter changes by calculating link costs based on collected link information and using these cost parameters to select optimal routes. The control device transforms physical key distribution constraints into calculable cost parameters, enabling systematic optimization through parameter-based decision making.
3Reliability
If link information is collected and route selection is optimized, then key supply reliability is improved, but processing time and computational load increase
Solution Approach 1:
The system applies partial action by collecting only the necessary link information required for route optimization rather than comprehensive network state data. The control device calculates link costs using selective link information, reducing processing overhead while maintaining sufficient accuracy for reliable key supply.
Data Source
AI summary
A quantum cryptographic communication control device includes a collection unit, a calculation unit, a guarantee unit, and a selection unit. The collection unit collects link information of a link for which a local key is generated by quantum key distribution and a global key guarantee amount expected for a pair of applications that perform cryptographic communication by using a global key. The calculation unit calculates a link cost used for selecting a route of the global key based on the link information. The guarantee unit calculates an amount that can be guaranteed for a local key used in the link so as to satisfy the global key guarantee amount. The selection unit selects the route of the global key based on the link cost and the amount that can be guaranteed.