A Secure and Trusted Data Sharing Scheme Based on Blockchain for Government Data

There are many problems existing in government data sharing, such as poor security, privacy disclosure and low tamper-resistant modification. To address this issue, we propose a secure and trusted data-sharing model for government data sharing. Given the features of transparency and decentralization, blockchain makes data visible to everyone on the network and is inappropriate for certain situations. This paper transfers the original data to the InterPlanetary File System (IPFS) stor-age. To ensure the security of data sharing, achieve a multi- keyword searchable mechanism and speed up computations of encryption, we propose a cryptographic primitive developed by extending ciphertext policy attribute-based encryption (CP-ABE) and searchable encryption (SE). The experiment result shows that the data-sharing model can prevent malicious attacks and improve the speed of encryption and decryption.