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This paper presents a new block-wise fragile watermarking scheme based on scramble encryption to improve security. In the proposed algorithm, the watermark derived from a block is not embedded in the least significant bit (LSB) of itself; rather, it is randomly distributed onto the LSB of whole host image by scramble encryption. In the verification stages, the predefined threshold is used to localize and discriminate the various modifications, and its performance of tamper detection is discussed from the viewpoint of probability theory. Theoretical analysis and experimental results are given to validate the effectiveness of our method.

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