Open AccessTamper Detection of Digital Images using Hash Functions
Author(s) -
Chan-Il Woo,
Seung-Dae Lee
Publication year - 2014
Publication title -
journal of the korea academia-industrial cooperation society
Language(s) - English
Resource type - Journals
eISSN - 2288-4688
pISSN - 1975-4701
DOI - 10.5762/kais.2014.15.7.4516
Subject(s) - watermark , digital watermarking , least significant bit , computer vision , digital image , artificial intelligence , computer science , hash function , block (permutation group theory) , image (mathematics) , authentication (law) , distortion (music) , image processing , mathematics , computer security , computer network , operating system , geometry , bandwidth (computing) , amplifier
Digital watermarking for digital image authentication and integrity schemes are based on fragile watermarking and can detect any modifications in a watermark embedded image by comparing the embedded watermark with the regenerated watermark. Therefore, the digital watermark for image authentication and integrity should be erased easily when the image is changed by digital image processing, such as scaling or filtering etc. This paper proposes an effective tamper detection scheme for digital images. In the proposed scheme, the original imagewas divided into many non-overlapping 2×2 blocks. The digital watermark was divided into two LSB of each block and the image distortion was imperceptible to the human eye. The watermark extraction process can be used to determine if the watermarked image has been tampered. The experimental results successfully revealed the effectiveness of the proposed scheme. Key Words : Fragile Watermarking, Spatial Domain, Tamper Detection 2013 .
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