Verifiable and secure privacy amplification method based on quantum key distribution

Abstract

The invention discloses a verifiable and secure privacy amplification method based on quantum key distribution. The method comprises the steps of S1, generating an initial random number string W, respectively generating random number strings K<mis,A> and K<mis,B> by two communication parties (Alice and Bob) in a base comparison process of quantum key distribution, and combining the two random number strings into a random number string W=[<Kmis,A>, K<mis,B>] by the Alice; S2, verifying randomness, after an error correction phase of the quantum key distribution is finished, estimating the minimum entropy lower limit of the W relative to an attacker Eve, wherein H<min>(W|E) is greater than or equal to 1-H<2>(e); S3, calculating a final secure key length N<f>; S4, extracting a perfect random string W*, through adoption of a partial pre-shared secure key of the two communication parties, constructing a Toeplitz matrix H<R>, and extracting the perfect random number string W* from the W according to the H<R>; S5, negotiating a universal hash function H<PA> through a public channel according to the W*; and S6, respectively carrying out hash operation on error corrected key strings by the two communication parties according to the H<PA>, and generating a final secure key. The method has the advantages of verifiability, security, easy realization and simplification of quantum key distribution system design and realization.

Description

technical field [0001] The invention relates to a verifiable security enhancement method, in particular to a verifiable security enhancement method for quantum key distribution. Background technique [0002] Quantum key distribution, based on the basic principles of quantum physics, can distribute information-theoretical security keys for both parties in communication. Privacy Amplification is a crucial step for the quantum key distribution system to achieve secure key distribution. Its goal is to remove part of the key string information that the attacker may obtain during quantum physical communication and post-processing, and generate The ultimate key that is information-theoretic secure against an attacker. [0003] In the process of confidentiality enhancement, the communication parties negotiate the Universal Hash Function (Universal Hash Function) through an open channel, and obtain the final security key by hashing the weak security key string generated and error-co...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that, aiming at the security threats faced by the random number source selection and construction existing in the security enhancement method in the existing quantum key distribution system, the present invention provides a verifiable security security method for quantum key distribution Enhanced method

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