Data management method and device and data query method and device

• Main Authors: LI MANXIAO, SU HENG, YAO XINLIANG, YANG HAOYUAN
• Format: Patent
• Language: Chinese; English
• Published: 02.06.2023
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The invention provides a data management method and device and a data query method and device, which can be used in the financial field or other technical fields. The method comprises the following steps: constructing an access structure tree for a piece of data to be subjected to uplink evidence storage according to the attribute of a user having access authority to the piece of data; according to the access structure tree, executing attribute-based encryption on the data to be subjected to uplink evidence storage to obtain encrypted data of the data; encrypting the access structure tree in which part of information is hidden by using a temporary key to obtain an encrypted access structure tree; sharing the temporary key to block chain nodes through a secret sharing technology, wherein each block chain node has a fragment of the temporary key; and sending the encrypted data and the encrypted access structure tree to the block chain node. According to the data management method and device and the data query m