Data access method and device based on attribute-based encryption block chain

The embodiment of the invention provides a data access method and device based on an attribute-based encryption block chain. After receiving a data access request sent by a first node, a blockchain server judges whether a first attribute base carried by the data access request meets an access constraint condition of the first block or not, if so, it is indicated that a user accessing the first block through the first node has an access permission, and the block chain server acquires decrypted data by utilizing the first attribute base and sends the decrypted data to the first node. In the process, the first attribute bases carried by the data access requests sent by different users are different, and the decrypted data corresponding to the first block can be accessed only when the first attribute bases meet the access constraint condition of the first block, so that multi-level and fine-grained access control can be realized for complex data. 本发明实施例提供一种基于属性基加密区块链的数据访问方法及装置，区块链服务器接收到第一节点发送的数据访问请求后，判断该数据访问请求携带的