Abstract: Blockchain technology has the advantages of decentralization,trust removal,anonymity and non-tamperable.In order to more effectively ensure that users can safely identify and connect to the wireless network,this paper proposed a multi-stage cascade wireless security authentication scheme(MWSASB) based on blockchain technology.The MWSASB program designs a multi-stage cascade protocol process:registration phase,login and certification phase,and transaction phase.And it records the transaction of users’ information in the non-tamper and decentralized blockchain ledger by using workload proof and the extension of the longest chain.Firstly,during the registration phase,the user enters the registration information Then the cryptographic technology and the consensus mechanism are used to store the registration information on each node of the blockchain in the decentralized network.At the same time,during the login and authentication phase,the user inputs the login information,then login and authenticate with the blockchain server.After successful authentication the login information is also stored on each node of the blockchain.Secondly,in the transaction phase,the registration information and the login and authentication information are used to ensure that their information are securely recorded in the blockchain in the form of transactions.Finally,the security and computation of the MWSASB are analyzed.The results show that the MWSASB has security attributes such as wireless security authentication and can effectively avoid various common network attacks such as man-in-the-middle attacks,DDoS attacks,etc.In terms of computation,blockchain cannot be tampered with and cryptographic algorithm and consensus mechanism can be used for encryption verification,which can effectively reduce the number of calculations and improve the efficiency of security authentication.

Key words: Blockchain, Consensus mechanism, Decentralization, Multi-stage cascade, Wireless security authentication