The development of social networks, e-commerce, mobile communications, and the Internet
of Things (IoT) has pushed human society into the era of network big data. Network big data comes from different industries such as financial transactions, urban management, vehicle networks, and medical care. These industries generate large amounts of data every day, but these data are only controlled by government agencies, business alliances, research institutions, and individuals. This centralized data management method means that the data value is not well-developed by more users. Although many applications are driving big data sharing, there is still a large amount of data in the individual, which will hinder the conversion of data into value. Hence, it is necessary to establish a fair and secure data sharing environment to achieve negotiation and transaction.
Blockchain shows a decentralized distributed ledger database that sorts events in time series. When recording user transaction information, cryptographic techniques are added to achieve secure interaction of multiple individuals’ information. The main value of the blockchain is to propose a consensus mechanism that can help two parties to conduct secure transactions without an intermediary. The blockchain establishes a (P2P) network, which establishes a direct connection between the resource provider and the demander by using public and private keys. The sharing mechanism based on the blockchain can not only improve the efficiency of multi-platform data, but also increase the security of information transactions. Its advantage comes from the high-frequency transmission of data, because each update of the ledger needs to be backed up by all users. Obviously, while it improves the efficiency of data utilization, it also increases the pressure of network transmission.
To achieve secure sharing of network big data, the blockchain is applied to the network big data sharing work. Currently, a key issue in this work is to ensure the multi-user reasonable backup of the ledger update. There are supposed to be n users in a blockchain. When a user generates a transaction in the chain, other users must back up the transaction information. When the transaction information occupies a large memory, there is a phenomenon that network resources are wasted and the transmission load becomes large. In this article, the author propose a block-based network big data security sharing framework, which implements distributed storage of industry big data. Meanwhile, the author added (TPM) to distributed storage data to prevent malicious changes to transaction data by data occupants.
The rest of this article is organized as follows. This article reviews the latest literature on big data and blockchain. On this basis, a blockchain-based sharing framework of network big data is proposed. This article discusses the details of the research challenges and then describes the possible solutions and their applications. Finally, the work of this article is summarized, and future research issues are presented. Blockchain technology is a new technology that integrates cryptography, computer science, and mathematics. This paper proposes a decentralized medical big data security sharing scheme based on blockchain technology. In-depth study of the technical principles of the blockchain, including P2P network technology, full homomorphic encryption technology, consensus mechanism, and other key technologies. Establish a medical data sharing model based on blockchain technology, and analyze the requirements of the model. It achieves security without affecting application and data analysis, including privacy security and secure transmission.
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