An Image AuthenticationTechnique Using Watermarking and Hash Function

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M.Kameswara Rao
Y. Rama Krishna, K.Kiran Kumar


The rapid expansion of the Internet has increased the availability of digital data such as audio, images and videos to the public. The
advances in multimedia and communication technology have introduced new methods for manipulation and unauthorized use of digital content.
Protecting multimedia information becomes more and more important from illegal duplication. Digital watermarking of images is one of the
approaches to protect image data by embedding secret data within the image. This embedded data can be detected and extracted for substantiating
the validity of the content at times of controversies. In this paper, watermarking based image content authentication technique is developed using
hash function. The proposed method first extracts the hash value of the image, embeds it in to the image and later verifies for content
authentication. Experimental simulations are provided using MATLAB 7.1. The scheme contains three phases: Hash value generation phase,
embedding phase and verification phase.



Keywords— copyright protection, hash function, watermarking.


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