Multi-Layer Secret Key Sharing via Directional Carrier Waves
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Solution Overview
Problem
Conventional cryptographic communication systems with information-theoretic security lack efficiency and scalability due to small secret key sizes and complex control procedures resulting from a single key distillation process.
Innovation Solution
A secret key sharing system with multiple layers of transceivers that perform key distillation multiple times, using directional carrier waves and public communication paths to share and compress secret keys through bit error rate estimation, correction, and privacy amplification, allowing efficient and scalable key distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a key distillation process is collectively performed only once in conventional cryptographic communication systems, then information-theoretic security is achieved, but the sizes of secret keys in respective nodes become small and communication efficiency deteriorates
Solution Approach 1:
The patent divides the key distillation process into multiple separate executions rather than one collective process. Each node performs key distillation independently multiple times, generating multiple secret keys of adequate size. This segmentation resolves the contradiction by allowing each node to achieve sufficient key size without requiring inefficient collective communication for every key generation.
Solution Approach 2:
The patent implements periodic key distillation where nodes perform the key distillation process at regular intervals or multiple times rather than once. This periodic execution allows nodes to accumulate sufficient secret key material through repeated operations, improving communication efficiency while maintaining security through the information-theoretic properties of each distillation instance.
2Device complexity
If a key distillation process is collectively performed only once, then system control is simplified, but scalability deteriorates due to complicated control procedures
Solution Approach 1:
The patent segments the key management architecture so that each node independently performs key distillation without requiring complex centralized coordination. This independent segmentation allows the system to scale easily as nodes are added, since each new node can autonomously participate in the key management process without complicating the overall control structure.
Solution Approach 2:
Each node performs key distillation autonomously without requiring complex external control or coordination from other nodes or a central authority. This self-service approach simplifies system control while enabling scalability, as each node can independently generate and manage its secret keys through repeated distillation processes.
3Loss of energy
If secret key sizes are small due to single key distillation, then communication overhead is reduced, but security strength deteriorates
Solution Approach 1:
The patent employs periodic or repeated key distillation processes where nodes generate multiple secret keys through multiple distillation executions. This allows nodes to accumulate sufficient key material (achieving adequate security strength) while maintaining efficient communication by only transmitting necessary key portions during each periodic operation, thus resolving the trade-off between communication overhead and security strength.
Data Source
AI summary
A secret key sharing system includes a transceiver in a first layer, a plurality of transceivers in a second layer, and a plurality of transceivers in a third layer. The transceivers in the second layer receive a first random number from the transceiver in the first layer via a directional carrier wave. The transceivers in the third layer receive a second random number from one of the transceivers in the second layer via the carrier wave. The transceiver in the first layer and the transceivers in the second layer share a first secret key based on the first random number, and the one of the transceivers in the second layer and the plurality of transceivers in the third layer share a second secret key based on the second random number.