TAILIEUCHUNG - Báo cáo hóa học: "Research Article A Workbench for the BOWS Contest"

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: Research Article A Workbench for the BOWS Contest | Hindawi Publishing Corporation EURASIP Journal on Information Security Volume 2007 Article ID 64521 10 pages doi 2007 64521 Research Article A Workbench for the BOWS Contest Andreas Westfeld Instititute for System Architecture Department of Computer Science Technische Universitat Dresden 01062 Dresden Germany Correspondence should be addressed to Andreas Westfeld westfeld@ Received 8 May 2007 Revised 24 August 2007 Accepted 22 October 2007 Recommended by A. Piva The first break our watermarking system BOWS contest challenged researchers to remove the watermark from three given images. Participants could submit altered versions of the images to an online detector. For a successful attack the watermark had to be unreadable to this detector with a quality above 30 dB peak signal-to-noise ratio. We implemented our experiments in R a language for statistical computing. This paper presents the BOWS package an extension for R along with examples for using this experimental environment. The BOWS package provides an offline detector for several platforms. Furthermore the particular watermarking algorithm used in the contest is analysed. We show how to find single coefficient attacks and derive high-quality images dB PSNR with full knowledge of the key. Copyright 2007 Andreas Westfeld. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The first break our watermarking system BOWS contest challenged researchers to remove the invisible watermark from three given greyscale images of a strawberry a landscape and a church . The Watermarking Virtual Lab of the European Network of Excellence ECRYPT announced this contest in the middle of December 2005 1 . Participants could submit altered versions of the images to an online detector through a web interface 2 . For a successful .

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