A Physical Layer Security Key Extraction Method Based on Fuzzy Extractor Negotiation

Abstract

The invention discloses a physical layer security key extraction method based on fuzzy extractor negotiation, aiming to solve the problems of low key generation rate, high key inconsistency rate, information leakage and the like when extracting keys between IoT devices. The technical solution is to build a physical layer security key extraction system based on negotiating fuzzy extractors, use an adaptive multi-bit quantization algorithm to quantify the extracted channel features, and adaptively select the length of quantization bits according to the variation range of channel features; The code encodes the extracted channel features; the IoT device groups the quantized initial keys and negotiates a consensus key using a "digital lock"-based fuzzy extractor. The present invention can improve the efficiency of key negotiation, avoid the problem of high key inconsistency rate caused by channel characteristic mutation, and can effectively reduce the communication rounds and information leakage between IoT devices in the key extraction process.

Description

technical field [0001] The invention belongs to the security communication field of the Internet of Things, and in particular relates to a method for extracting a physical layer security key based on fuzzy extractor negotiation. Background technique [0002] For the first time in 2020, IoT-connected devices outnumbered non-IoT-connected devices. Of the 21.7 billion actively connected devices in the world, 11.7 billion (54%) will be IoT-connected by the end of 2020. The large-scale IoT system is deployed in many aspects such as urban construction, industrial control, and intelligent life, which can realize the true interconnection of all things. However, due to the inherent broadcast nature of wireless communication, malicious attackers can launch various passive attacks (such as eavesdropping, traffic analysis and monitoring, etc.) and active attacks (such as modification, impersonation and replay, etc.). Therefore, the information transmission of the Internet of Things sy...

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to propose a key extraction method that has the characteristics of coping with sudden changes in channel characteristics, high key generation rate, less interaction times, and able to resist malicious attacks. In the scene of key extraction, it solves the problems of low key generation rate, high key inconsistency rate, high communication overhead, leakage of certain information and complex coding when extracting keys between IoT devices, and effectively improves the security of IoT device communication.

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