Robust watermark detection method and device for data flows

Abstract

The invention relates to a robust watermark detection method and device for data flows. The watermark detection method comprises the following steps of: obtaining data items which form a data flow, wherein the data items at least comprise perception data and time stamps; determining data items for watermark bearing according to the time stamps and a probability p; carrying out hash function calculation on the time stamps in the data items for watermark bearing by adoption of a grouping secret key, and dividing the data items into a group A and a group B according to the obtained hash value; and calculating an accumulated value of differences of perception data of the two groups of data of the group A and group B, when the number of data items of the two groups of data is greater than a preset number, calculating an average difference value between the two groups of data, when the average difference value is greater than a preset threshold value, judging that a watermark exists, and otherwise, judging that the watermark does not exist. According to the method, the data items for watermark bearing is determined according to the time stamp and the data items are grouped, so that the successful detection of the watermark is ensured and the attack resisting ability is ensured at the same time.

Description

[0001] This application is a divisional application with an invention title of "Robust watermark embedding method and detection method and device for data stream". The filing date of the original application is 2017.6.13, and the application number is 201710441578.4. technical field [0002] The invention relates to a watermark method, in particular to a robust watermark detection method and device for data streams. Background technique [0003] With the development of the Internet of Things technology, more and more small smart hardware is widely used, such as wristbands, environmental detection devices and so on. Such devices can collect data through various sensors and cache or transmit the data. These data are often continuously generated and transmitted in the form of data streams. In the era of big data, data collected in many application scenarios has commercial value, so copyright protection is a problem that must be solved. However, such devices often have a commo...

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Problems solved by technology

[0013] The technical problem to be solved by the present invention is that there is a lack of effective robust watermark embedding and detection methods for data streams transmitted in a resource-constrained environment network in the prior art, and a robust watermark embedding method for data streams is provided And watermark detection method and device

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