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A new adaptive blind watermarking scheme that the watermarks are encrypted by double random-phase encoding technique in DWT domain is presented. Using fuzzy c-means clustering (FCM) technique and human visual system (HVS), the watermark can be adaptively embedded according to block classification. To keep imperceptibility and robustness, a novel iterative embedding algorithm is adopted to change the to-be-embedded coefficients. The experimental results demonstrate that the proposed scheme provides good robustness to withstand different kinds of common attacks.