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Several methods of marking designs to help identify ownership have been proposed. All of these methods have a high degree of difficulty in watermark proof. We attack this problem by proposing a new watermarking technique at the state machine level along with assisting hardware to accomplish proof of ownership straightforwardly. Our experiments on benchmark circuits and an example system-on-chip (SoC) indicate a negligible increase in delay and an extremely small increase in the requireddoi:10.1109/dtis.2014.6850644 dblp:conf/dtis/BikosV14 fatcat:4au3uhpkq5avzlbhgj6ueygay4