Study On Mutual Mapping Cores Watermarking Algorithm Based On Secret Segmentation Mechanism

As we all know,the traditional digital watermarking technology is widely used on the multimedia carrier of images,video and text,the related technology has been very matured.The features of simple operation,strong robustness and detection flexible ideal for protecting intellectual property of digital products.But in the age of widely using embedded systems,integrated circuit design and mobile intelligent terminal,the protection of intellectual property cores are still in the stage of research.At present,more and more circuit designers select FPGA(Field Programmable Gate Array)as a development platform,compared to ASIC(application specific integrated circuit),the characteristic of the fast product saves lots of cost and time.Also,the module feature of FPGA itself generates the technology of reuse cores.In the process of reusing cores,the owners do not want their cores using by other developers unlawfully,therefore,how to design an efficient FPGA cores watermarking scheme to protect the intellectual property of cores has been focused by the industry research.Firstly,this work analyzes and improves existing FPGA based IP watermarking techniques,using the special internal structure of FPGA circuit,through designing a special constraint to embed the copyright information on the original design,hiding to each unique sub-module cores circuit,without change the performance of circuit.When the cores which have intellectual property has been stolen,we can use the appropriate technical means to extract the copyright information form the controversial cores,thus solving the problem of copyright ownership;Then,to solve the problem of verification difficulty after watermarks in the cores have been attacked,we propose a mapping cores watermark mutual authentication scheme which based on secret segmentation mechanism.This scheme base on the problem of watermarks may be illegal attacked,embedding the double watermark in the cores,which can increase the capacity of watermark,using the key reconstruction principle of secret segmentation mechanism,constructed special expression between the dual watermark,establish mutual mapping function and using compressing mechanism to embed the mutual mapping factor in the cores;Finally,experimental tests and results showed that: the algorithm can reconstruct the original watermark after the removal attacking,which has a strong ability to resist the removal attacking.Also,by comparison with other watermark algorithm,this algorithm has more advantages on watermark capacity,concealment and share resources.In summary,the results of this study can be used by cores manufacturers,IC development companies and related organizations as a method of cores copyright identification,while playing a more good positive role on promoting the integrated circuit cores copyright protection technology development and innovation.