IMPLEMENTASI ASYMMETRIC-WATERMARKING BERBASIS PERMUTASI RC-4 PADA KOEFISIEN DWT CITRA DIGITAL
Accessing the digital image data is increasingly easy and widespread, causing the need for a security system that protects information from those who are not responsible. One method of protection for digital image data is the Digital Image Watermarking. Discrete Wavelet Transform (DWT) is widely use...
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| Main Authors: | , |
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2011
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| Subjects: | |
| Online Access: | https://repository.ugm.ac.id/90860/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=53157 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | Accessing the digital image data is increasingly easy and widespread,
causing the need for a security system that protects information from those who
are not responsible. One method of protection for digital image data is the Digital
Image Watermarking. Discrete Wavelet Transform (DWT) is widely used in the
domain of watermarking techniques.
By always assume that the algorithm can be owned by anyone, asymmetric
watermarking method can bridge the digital image so that watermark contained in
the host remains safe. Permutations which are difficult to trace is one of solving
this problem. RC-4 permutation method based on logistic map, with the concept
of embedding a digital image of the dwt coefficients proposed by several
researchers.
Test results show that the DWT domain is more robust against geometric
attacks rotation and resizing images than in DCT domain. Watermark detection,
performed by applying the correlation test, obtained is always positive on all nonmalicious
attacks (cropping, compression, noise, sharpening resizing, and
rotation), except in size reduction watermarked images smaller than 22% also
noise and salt & peppers on a coefficient greater than 0.1%. While on extraction,
throughout the testing without an attack or with non-malicious attacks, the
watermark extracted, except for cutting images to watermark permuted, reduction
and JPEG compression with quality less than 100%. Setting some coefficients
such as the coefficient of the insertion threshold, the watermark strength, and
coefficient of the watermark itself, can produce a reliable copyright on a host. |
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