Postprocessing method for quantum key distribution

Abstract

The invention provides a postprocessing method for quantum key distribution. The postprocessing method comprises the following steps of S1, performing information interaction and local postprocessing by a transmitting party and a receiving party, thereby acquiring a first shared key from transmitting information of the transmitting party and acquiring a second shared key from receiving information of the receiving party; S2, performing error correction on the first shared key and the second shared key; S3, verifying whether the first shared key and the second shared key are same, if yes, performing a step S4, and otherwise returning to the step S2; S4, evaluating the size of the leakage information by the transmitting party and the receiving party, and acquiring a safe key from the first shared key and the second shared key according to the size of the leakage information through a privacy amplification process; and S5, storing the safe key in a key pool by the transmitting party and the receiving party. The postprocessing method can improve correctness and safety in quantum key distribution.

Description

technical field [0001] The invention relates to the technical field of Internet communication, in particular to a post-processing method of quantum key distribution. Background technique [0002] With the rapid development and widespread popularization and application of the Internet, the importance of communication security is constantly increasing. In many cases, the communication parties hope to transmit information through public channels while ensuring the privacy of the information. For example, when a bank asks a user for an account number and password, the user always hopes that the information they transmit through the public channel is private and cannot be obtained by a third party. By encrypting the information one-time pad, the privacy and security of the information can be guaranteed. But this requires both parties to share a large number of private keys. The security of classical communication protocols is based on mathematical computational complexity by s...

AI Technical Summary

Problems solved by technology

However, because the quantum key distribution technology is still in the development stage, the existing post-processing schemes are often completed according to certain empirical steps in experiments and practical applications

Since the post-processing process is not carried out in accordance with strict security proof methods, the current post-processing scheme of quantum key distribution may have potential security risks

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