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Watermarks and Text Transformations in Visual Document Authentication

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Figure

Figure 1. An example of splitting a black (left) and a white (right) pixel in two shares for visual cryptography
Figure 2. Document authentication protocol with possible attack points for Mallory
Figure 4. An example attack with randomly inverting shares of pixels that need to be manipulated
Figure 7.Example of visually transformed text and attacks on it. Mallory introduces only a minor modification, trying to change one digit inthe account number

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