Data watermark processing method, equipment and medium

Abstract

The invention discloses a data watermark processing method and device and a medium, and the method comprises the steps: determining a data partition corresponding to a tuple according to a primary key value of the tuple; judging whether the tuple meets the watermark embedding condition of the data partition or not, and if yes, intercepting a corresponding watermark from the watermark set according to the length of the watermark required to be embedded by the tuple; selecting two attribute fields from the tuple, performing difference expansion on original attribute values according to the original attribute values corresponding to the attribute fields and the watermarks so as to embed the watermarks into the original attribute values, and obtaining the attribute values embedded with the watermarks; selecting a plurality of appointed tuples from the plurality of tuples corresponding to the data to carry out watermark detection so as to determine whether a watermark is embedded in the data or not; under the condition that the watermark is embedded in the data, the attribute value embedded with the watermark is extracted from the data, difference expansion inverse operation is carried out on the attribute value so as to restore the attribute value to the corresponding original attribute value, and copyright verification of the data is achieved through the original attribute value.

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