High-speed privacy amplification method for supporting large-scale input blocks in quantum key distribution system

Abstract

The invention discloses a high-speed privacy amplification method for supporting large-scale input blocks in a quantum key distribution system. The high-speed privacy amplification method adopts a simplified Toeplitz matrix as a universal hash function family, splits the Toeplitz matrix into a plurality of sub-blocks with the same size, and utilizes fast Fourier transform for accelerating a product of corresponding Toeplitz matrix blocks. The high-speed privacy amplification method has the advantages of better system safety, higher processing speed and the like.

Description

technical field [0001] The invention mainly relates to the technical field of quantum key distribution, in particular to a high-speed security enhancement method for supporting large-scale input blocks in a quantum key distribution system. Background technique [0002] Quantum key distribution technology based on quantum mechanics can achieve unconditionally secure communication. In recent years, various quantum key distribution systems have been realized and widely used in society. A quantum key distribution system mainly includes two stages: the quantum interaction part stage and the post-processing stage. Among them, the post-processing stage uses traditional computer algorithms to extract the final security key from the qubits obtained in the quantum interaction part. The traditional post-processing stage mainly includes: base comparison and data screening, error correction and security enhancement. Through security enhancement, the information that may be leaked in t...

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Problems solved by technology

However, when FFT processes the input of large-scale input blocks, its calculation speed and calculation accuracy will be reduced, which cannot meet the requirements of the quantum key distribution system.

[0007] Second, due to the limitation of proprietary hardware resources, it is impossible to process large-scale input while maintaining a high throughput rate.

[0008] It can be seen from the above that the security enhancement technology based on proprietary equipment and FFT technology in the traditional quantum key distribution system cannot meet the high-speed real-time processing of large-scale input requirements of the actual quantum key distribution system.

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