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Digital-invisible-ink data hiding based on spread-spectrum and quantization techniques

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Academic year: 2021

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Fig. 1. Real-world espionage scenario using the invisible ink.
Fig. 2. Geometric models of spread-spectrum watermarking: (a) general case and (b) informed-embedding case.
Fig. 4. Flowchart of the iterative informed-embedding system that enables the invisible-ink liked behavior
Fig. 5. Securing hidden message using the proposed DII scheme.
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