A Verifiably Secure Privacy Enhancement Method for Quantum Key Distribution

Abstract

Disclosed in the present invention is a verifiable and secure privacy amplification method for quantum key distribution, comprising the steps of: S1. generating an initial random number string W, two communication parties (Alice and Bob) respectively generating random number strings Kmis,A and Kmis,B during the basis comparison process of quantum key distribution, and then Alice merging the two random number strings into a random number string W = [Kmis,A, Kmis,B]; S2. performing randomness verification: after an error correction stage of quantum key distribution ends, estimating the lower limit of the minimum entropy Hmin(W|E) ≥ 1-H2(e) of W with respect to an attacker Eve; S3. calculating a final security key length Nf; S4. extracting a perfect random string W*: by pre-sharing part of the security key between the two communication parties, constructing a Toeplitz matrix HR, and extracting a perfect random number string W* from W according to HR; S5. issuing a negotiation-size universal hash function HPA according to W*; and S6. the two communication parties respectively performing, according to HPA, a hash operation on the error-corrected key string, so as to generate a final security key. The present invention has advantages such as being verifiable and secure, being easy to implement, and being able to simplify the design and implementation of a quantum key distribution system.

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 (Privacy Amplification) is a crucial step for the quantum key distribution system to achieve secure key distribution. The ultimate key that is information-theoretic secure against an attacker. [0003] During the security enhancement process, 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-corrected through negotiation between the two parties. In an actual quantum key distribution system, an additional source of random numbers i...

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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