Application And Research On Internet Of Things Of Blockchain Algorithm

As one of the most innovative technologies in the 21 st century,the Internet of Things has attracted widespread attention from industry and even academia.It has realized the transformation from the interconnection of all things to the intelligent connection of all things,bringing new development opportunities for the future financial and non-financial fields.Meanwhile,the advantages of blockchain,such as decentralization and unforgeability,provide technical support for the Internet of Things,which has great development potential.However,while the Internet of Things is changing people's lifestyles,there are also some security issues that need to be resolved.Whether or not an effective solutions can be proposed will directly affect the landing and expansion of the Internet of Things.This paper will explore the typical applications of the Internet of Things: Electronic Ticketing System and Data Sharing System,and then construct blockchains with special functions to meet the corresponding security needs.In the blockchain-based electronic ticketing system,the most important issues are users' privacy and ticket trading security.In the blockchain-based data sharing system,users are most concerned about the security of key storage and data sharing efficiency.Therefore,in response to the above challenges,this paper aims to research the following works.(1)Improve the trading quality of tickets and protect the privacy of users in the electronic ticketing system.In the electronic ticketing system,the malicious behavior of scalpers destroys the equality between consumers and merchants in the trading,and affects the market price and happiness index of consumers.At the same time,the user's anonymity and the tickets' certain characteristics also need to be guaranteed.In view of the above challenges,this paper proposes an electronic ticketing system based on the consortium blockchain.Firstly,the system is built by the Delegated Proof of Stake consensus mechanism and consortium blockchain to generate system parameters,users' key pair as well as certificate,and merchants' key pair.Among them,the mixed currency protocol based on ring signature is used to protect the anonymity of users as well as their wallet addresses,and to resist malicious attacks such as double-spending attacks.In the process of transferring tickets,a tax mechanism combined with regulatory mechanism is proposed to resist the scalper attack.At the same time,the paper also optimized the transfer algorithm to achieve a win-win situation for both parties.This measure cannot be taken in the past.Finally,the security and efficiency of our scheme are analyzed.(2)Improve the security of key storage and the efficiency of data search in data sharing system.On the one hand,since the devices in the Internet of Things are usually lightweight,the traditional schemes make the data sharing system restricted in practice.On the other hand,the problem of key-leakage also makes the scenario of data search and trading very serious.Once the key is leaked,the security of the system also collapses.To solve the above challenges,this paper proposes a key aggregation searchable encryption scheme with auxiliary input.And based on this scheme,a blockchain-based data sharing system is established to realize the secure data sharing of encrypted files.First of all,this paper achieves the security target of Anti-Key-Leakage through a basic Choose Plaintext Attack secure scheme.Secondly,based on the basic scheme,we also give an improved Chosen Ciphertext Attack secure scheme,which is proved by Game-based way under the expanded Decisional Diffie-Hellman Assumption and the Goldreich-Leivin Theorem.At the same time,the paper also uses the improved scheme to establish a data sharing system based on blockchain,which improves the search efficiency and connects the global ecology.Finally,the security and efficiency of the proposed system are analyzed,which shows that the scheme is effective in enhancing the Internet of Things.