Tampering attacks on binary phase only filter-based watermarking schemes for image authentication

摘要

Recently, a category of watermarking techniques based on binary phase-only filter (BPOF) has been proposed for image authentica-tion. In such techniques, the authentication is implemented by evaluating the correlation between Fourier phase information and the hidden water-mark bitplane. In this paper, we reveal the security flaws of BPOF-based watermarking algorithms and propose sophisticated tampering attacks against them. We show how the attacker can easily tamper with a water-marked image without being detected. Experimental results demonstrate that our attacks are successful in tampering watermarked images. The watermarking schemes are proven to be fundamentally flawed.