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Felton letter - PowerPoint PPT Presentation

Watermarking and Steganography

Watermarking and Steganography . Watermarks. First introduced in Bologna, Italy in 1282 Dandy Roll presses pattern into drying paper Changes thickness of paper fibers Uses: By paper makers to identify their product Security for stamps, official documents. Stock certificates, money, etc.

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Felton letter - PowerPoint PPT Presentation

Watermarking and Steganography