Quantum Share Distribution for Uneven QKD Key Rates
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Solution Overview
Problem
Existing quantum cryptography storage systems face inefficiencies due to differences in quantum key sharing rates between node pairs, leading to slower transmission times and incomplete distributed storage processing when using one-time pad encryption with quantum keys.
Innovation Solution
A quantum cryptography storage system that determines a distribution mode of shares based on the available quantum key sharing rates between nodes, adjusting the size and number of shares to ensure balanced transmission times across all node pairs, thereby ensuring information-theoretic security and completing distributed storage more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-time pad encryption with quantum keys is used for distributed storage, then information-theoretic security is ensured, but transmission time increases due to differences in quantum key sharing rates between node pairs
Solution Approach 1:
The patent dynamically adjusts share sizes based on quantum key sharing rates between node pairs. By changing the parameter of share size according to the key sharing rate, the system optimizes transmission time while maintaining security. Nodes with higher key sharing rates receive larger shares, while nodes with lower rates receive smaller shares, balancing the overall distributed storage completion time.
2Device complexity
If fixed share sizes are used in distributed storage, then simplicity is maintained, but transmission efficiency decreases when quantum key sharing rates vary between node pairs
Solution Approach 1:
The patent implements a dynamic distribution mode where share sizes are not fixed but are determined based on real-time quantum key sharing rates. The distribution control device calculates optimal share sizes for each node pair according to their key sharing capabilities, making the system adaptive to varying network conditions and key generation rates, thereby improving overall distributed storage efficiency.
3Reliability
If quantum keys are generated and shared between all node pairs, then security is maximized, but key generation overhead and system complexity increase
Solution Approach 1:
The patent segments the key management process by establishing quantum key sharing relationships only between the distribution control device and individual shareholders, rather than requiring all-pair key sharing. This segmentation reduces the number of key management relationships from O(n²) to O(n), significantly lowering system complexity while maintaining security through the centralized control device that coordinates share distribution.
Data Source
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Figure 3A~3B
AI summary
According to an arrangement, a quantum cryptography storage system (100) includes a plurality of storage devices (3), a distribution control device (4), and a distribution device. The plurality of storage devices (3) are connected via a communication network. The distribution control device (4) determines a distribution mode of shares into which data is distributed, based on quantum key distribution network (QKDN) information. The generation device generates an encryption key and a decryption key by using a quantum key shared by using a QKDN. The distribution device distributes the data into the shares, based on the distribution mode. When receiving a share encrypted using the encryption key via the communication network, each of the plurality of storage devices (3) that stores the shares in a distributed manner decrypts the share encrypted with the decryption key and stores a share decrypted.