http://isrc.ulster.ac.uk steganography for secure digital watermarking 1 pratheepan yogarajah, dr....

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Steganography for Secure Digital Watermarking

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Pratheepan Yogarajah, Dr. Joan Condell, Dr. Kevin Curran, Prof. Paul Mc Kevitt

University of Ulster, UK

Dr. Abbas CheddadUmea University, Sweden

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Steganography

Key

Encoder

Cover Image

Secret Data

Stego Object

Decoder

Secret Data

Communications Channel

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Secure Digital Watermarking

Cover Image

Secret Data

Protected Image

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Digital content authentication

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Sorry - this is NOT original.

Test image Original image

Original Image Attacked Image

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Secret Data Cover Image Stego Object

Self-Embedding

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How to detect alterations (1/2)

Final ResultGrayscale image of

Altered image

Altered image

Extracted grayscale

image

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Original image Extracted image

How to detect alterations (2/2)

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Self-Embedding - Temporal information

UU SDW:American Beauty-045/789+0

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Key Frames

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Temporal content change detection

Original Video Attacked Video

Detected Video

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Conclusion A steganography based self-embedding technique

provides a solution for digital content authentication. Benefits

- Protects commercial value of digital content- Protects the secrecy of digital content- Protects digital content from modification

Applicable fields: film/animation, TV, games, music, images

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Thank You

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Secret Data Cover Image Stego Object

Self-Embedding

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How to detect alterations (1/3)

Altered Document

Recovered Document

Grayscale image of Altered Document

Final Result

Altered Document

Recovered Document

Grayscale image of Altered Document

Altered Document

Recovered Document