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With the rapid development of VLSI (Very Large Scale Integration) circuit, IP  (Intellectual Property) protection for reused technology is widely  concerned. A watermarking scheme for IP protection is proposed on basis of a  two dimensional chaotic mapping model (TDCM). The scheme utilizes a secure  and controllable embedding model to compute the aggregation level of  physical resource positions and the secure threshold of controllability. A  two dimensional chaotic sequence is generated with the control of secure  threshold. The first dimensional sequence is used to determine random  watermark positions and the second dimensional sequence is to control  watermark number in each position. Finally, the watermarks are inserted into  corresponding places orderly. The experiments show that the proposed scheme  has low resource overhead by comparing with other schemes. The resistance to  attacks and robustness of the watermark are encouraging as well.

TDCM: An IP watermarking algorithm based on two dimensional chaotic mapping