Beijing Volcano Engine Technology Co., Ltd.

Xinying Yang

Hao Yang

Qun Gao

A database management system provided in a trusted execution environment controls the visibility of a requested statistic for a database table column based on the source of the request. The visibility control is based on a visibility level of the database table column to the source of the request. The visibility of the provided statistic can further be based on a security level of the database table column even if the source of the request is not a permitted viewer. The statistic can include frequency or histogram data for the database table column.

Statistics visibility control in enclave database

The present disclosure relates to a data processing method and apparatus based on a Merkel tree, the method optimizes the structure of the Merkel tree so that when generating a Merkel tree to be updated based on the original service data and inserting a new leaf node into the Merkel tree, no parent node is created for a leaf node without a sibling node and a non-leaf node without a sibling node; specially, when there is new service data, a corresponding new leaf node is created and inserted into the leaf node layer; if the new leaf node is located at an odd position in the leaf node layer, the non-leaf node layer does not need to be updated; if the new leaf node is located at an even position in the leaf node layer, a new non-leaf node is created and inserted into the non-leaf node layer.

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Beijing, China

Xinying Yang