BlockChain/ABE-based Fusion Solution for E-government Data Sharing and Privacy protection

the instinct characteristics of blockchain technology to write transactions on distributed ledgers offers new opportunities for government to improve transparency, prevent fraud, and establish trust in the public sector. However, there still exits the challenge to protect data confidentiality, authenticity and ownership when sharing and exchanging e-document in decentralized blockchain network. In order to address this concern, we propose a fusion scheme of CP-ABE and Blockchain called GovChain. In GovChain, a blockchain framework is used to implement trusted identity authentication environment and improve scalability of CP-ABE policy. Moreover, encrypted e-government documents are stored on off-chain InterPlanetary File System(IPFS) and the data users can be authorized to obtain the index of documents on the chain. Finally, the security analysis is given in GovChain to prove the security of proposed fusion scheme. Meanwhile, experimental results also show that our system is feasible and effective.