Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A Secure Watermarking Scheme for Buyer-Seller Identification and Copyright Protection | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 56904 Pages 1-15 DOI ASP 2006 56904 A Secure Watermarking Scheme for Buyer-Seller Identification and Copyright Protection Fawad Ahmed Farook Sattar Mohammed Yakoob Siyal and Dan Yu School of Electrical and Electronic Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Received 6 April 2005 Revised 17 January 2006 Accepted 29 January 2006 Recommended for Publication by Mauro Barni We propose a secure watermarking scheme that integrates watermarking with cryptography for addressing some important issues in copyright protection. We address three copyright protection issues buyer-seller identification copyright infringement and ownership verification. By buyer-seller identification we mean that a successful watermark extraction at the buyer s end will reveal the identities of the buyer and seller of the watermarked image. For copyright infringement our proposed scheme enables the seller to identify the specific buyer from whom an illegal copy of the watermarked image has originated and further prove this fact to a third party. For multiple ownership claims our scheme enables a legal seller to claim his her ownership in the court of law. We will show that the combination of cryptography with watermarking not only increases the security of the overall scheme but it also enables to associate identities of buyer seller with their respective watermarked images. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION With rapid growth of the Internet security of digital images is becoming a great concern. It has now become very easy to illegally copy modify and retransmit a digital image. Digital watermarking is a technique that provides a way to protect digital images from illicit copying and manipulation. A digital watermark is an imperceptible signal added to digital data called cover work which can be detected .
