Digital watermarking method

Abstract

The invention provides a digital watermarking method, which protects and checks an IP copyright by means of a digital watermarking technology and has the characteristics of high efficiency, low design cost, low overhead and high feasibility, etc. The technical scheme comprises a watermarking embedding part and a watermarking checking part. The watermarking embedding part comprises the following steps of: encrypting copyright information to generate digital watermarking; selecting a wire net which accords with a carrier for adding a digital watermarking condition in an IP domain territory; changing partial wiring trend of the wire net according to a set constraint condition; passively generating digital watermarking piece information according to the change of the topological structure of a constitutional diagram of the wire net and ambient nodes; normally embedding the piece information into the IP and generating a watermarking secret key after mapping the piece information on the digital watermarking; and outputting a domain territory data file with the digital watermarking information after all digital watermarking information are embedded into the IP. The watermarking checking part comprises the following steps of: extracting correlative information of the IP from a digital watermarking system database; watermarking the secret key and the original IP domain territory data; extracting the wire net from the original IP domain territory data according to the watermarking secret key information; watermarking the wire net with the same method of watermarking embedding; extracting the digital watermarking piece information if structure of the wire net is as the same as that of corresponding wire net in the IP to be checked; synthesizing all digital watermarking piece information to extract the whole digital watermarking information; comparing with the original digital watermarking stored in the database to check the IP and generate an IP copyright checking report.

Description

technical field [0001] The invention belongs to the technical field of digital watermarking of IP core integrated circuits, and relates to a method and a device for digital watermark embedding and verification of IP cores. Background technique [0002] With the rapid development of semiconductor technology, the capacity of very large scale integrated circuits (VLSI) follows Moore's law and doubles every 18 months. The high complexity of the chip system puts forward new requirements for chip design: relying on traditional design methods can no longer meet the needs of today's chip design, and it is imperative to establish a new and efficient design method. System-on-Chip (SoC) design has become a mainstream development trend in order to meet the requirements of low cost, high performance and low power consumption in integrated circuit design. IP (Intellectual Property) reuse plays a key role in solving the design level, reducing product cost, shortening the design cycle and ...

AI Technical Summary

Problems solved by technology

Its test results show that after adding the 1244-bit digital watermark, although the total wiring length of the circuit has not changed, the number of through holes has increased by 12%-13%, which will greatly affect the performance of the chip

[0007] The current digital watermarking technology, especially the digital watermarking technology in the front-end process, makes the original complex chip design more cumbersome and occupies a lot of design costs

At the same time, because the embedding of the digital watermark adds additional hardware resources, it brings some changes in the design area, connection length and parasitic capacitance to the chip design, which affects the overall performance of the chip.

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