Blockchain-Based Digital Asset Management Scheme with Ciphertext-policy Attribute-based Encryption and Proxy Re-encryption
Peng Zhao, Xiangwu Ding · 2023
The rapid development of digital technology has made digital assets increasingly important. In order to ensure the security of digital asset transactions and reduce the time and management costs for asset owner, we proposed a blockchain-based digital asset management scheme. Firstlly, we have designed a new access control scheme that combines the CP-ABE algorithm and proxy re-encryption algorithm to achieve access control of digital assets. Asset owner can flexibly sell them to different users. Our scheme uses group encryption approach, group encryption of digital asset data information (such as the key information for encrypting digital assets and the path information for storing digital asset et al.) according to the sensitivity level can effectively improve the computational efficiency of the scheme and reduce the time cost of asset owner. The agent only needs to encrypt once, and cannot access digital asset content during the encryption process. Secondly, by using the smart contract technology, a fair trade of decryption keys between asset owners and purchasers is achieved. In order to improve the fairness of transactions, our scheme introduces an audit management mechanism to ensure the normativity of digital assets and the fairness of transactions. To reduce the storage cost of blockchain, the Interplanetary File System (IPFS) is used for auxiliary storage to improve the storage efficiency of the scheme. Finally, the security analysis shows that our scheme has high security and resistance to collusion attacks. Functional analysis shows that our scheme is able to provide rich features to meet the variour need of users. Simulation results show that the scheme is more efficient compared to other schemes.