QKD Key Store Direction Binding to Prevent Key Collisions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In quantum key distribution networks, the synchronization and allocation of quantum keys between communication sites face challenges due to asynchronous path calculations and potential collisions of transmission keys, leading to security gaps and inefficiencies in key distribution.
Innovation Solution
Implementing a method where quantum keys are directly or indirectly linked with communication direction attributes, allowing them to be allocated and retrieved based on specific communication directions, using key IDs or dedicated key stores for each direction, and utilizing machine learning for dynamic weight adjustments to optimize key distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If quantum keys are stored in a shared key store accessible by multiple local key management systems, then key distribution can proceed in parallel, but key collisions occur when multiple LKMS access and consume the same key simultaneously
Solution Approach 1:
The patent segments the shared key store into direction-specific sub-stores or virtual partitions. Each communication direction (A→B and B→A) has its own dedicated storage area, ensuring that keys for different directions are logically separated. This segmentation prevents LKMS from accidentally consuming keys intended for the opposite direction while maintaining parallel access capabilities.
Solution Approach 2:
The patent implements preliminary binding of quantum keys to communication directions before the keys are consumed. When a key is generated or imported into the key store, it is pre-associated with its intended communication direction (source and destination). This preliminary action ensures that during key consumption, the LKMS can only select keys that match the required direction, preventing collisions before they occur.
2Reliability
If additional communication protocols are implemented to check key availability before consumption, then key collision security is improved, but temporal delays increase due to extra communication steps
Solution Approach 1:
The patent enables the key store to automatically verify key availability and direction matching without requiring additional communication between LKMS entities. The key store itself maintains the binding information between keys and communication directions, allowing it to autonomously determine whether a key is available and appropriate for consumption. This self-service mechanism eliminates the need for time-consuming inter-LKMS communication protocols while maintaining security.
Solution Approach 2:
The patent introduces the key store as an intelligent intermediary that manages key allocation and direction verification. Instead of LKMS entities directly communicating to check key availability, the key store acts as a mediator that receives consumption requests, verifies direction binding, checks availability, and performs consumption atomically. This intermediary approach centralizes the verification logic and eliminates distributed communication delays.
3Ease of operation
If quantum keys are not bound to communication directions, then key store flexibility and ease of operation are improved, but security gaps occur when keys are used in wrong directions
Solution Approach 1:
The patent applies local quality by binding the communication direction attribute specifically to each quantum key at its storage location. Rather than requiring complex global coordination or directional routing logic, each key individually carries its direction binding information. This localized attribute ensures that when a key is retrieved, its intended direction is immediately verifiable, providing security at the point of use without compromising operational simplicity.
Solution Approach 2:
The patent introduces asymmetry by treating quantum keys for different communication directions as distinct entities. Keys for direction A→B are bound with attributes different from keys for direction B→A, creating an asymmetric structure in the key store. This asymmetry ensures that a key generated for one direction cannot be mistakenly used for the opposite direction, as the binding attributes will not match, thereby providing inherent directional security.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention refers to a method for providing and allocating a quantum key to one of two communication sites (X, Y, Z) forming a communication link within a communication network, wherein at least one key store (202) is used as quantum key aggregating interim storage, wherein each quantum key stored in a respective key store (202) is directly or indirectly linked with a communication direction attribute which indicates for which of two possible directions of a communication between the two communication sites (X, Y, Z) the respective quantum key is to be used whereby the respective quantum key is allocated to and retrievable from the one of the two communication sites (X, Y, Z) which acts as sender in a respective communication. The invention also refers to a corresponding system, a corresponding QKD platform, a corresponding hierarchical QKD controller (204) and a corresponding computer program product.