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The paper proposes a method for tamper proofing digital images using the technique of digital watermarking. Many a times the published images are subject to tampering to an extent that the facts conveyed in the original image are distorted. The mechanism presented here describes a method for detecting the regions in image that were subject to illegal modifications. The method also can detect the portions in image that were exposed to vector quantization kind of attacks. Two essential requirements of watermarking process for tamper detection, blind and robust, stands fulfilled by the proposed algorithm. The watermarking technique presents an algorithm that employs a frequency domain embedding process using DWT.