Tham khảo luận văn - đề án 'báo cáo hóa học: " research article breaking the bows watermarking system: key guessing and sensitivity attacks"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Hindawi Publishing Corporation EURASIP Journal on Information Security Volume 2007 Article ID 25308 8 pages doi 2007 25308 Research Article Breaking the BOWS Watermarking System Key Guessing and Sensitivity Attacks Pedro Comesana and Fernando Perez-Gonzalez Signal Theory and Communications Department University of Vigo 36310 Vigo Spain Correspondence should be addressed to Pedro Comesana pcomesan@ Received 11 May 2007 Accepted 31 August 2007 Recommended by A. Piva From December 15 2005 to June 15 2006 the watermarking community was challenged to remove the watermark from 3 different 512 X 512 watermarked images while maximizing the peak signal-to-noise ratio PSNR measured by comparing the watermarked signals with their attacked counterparts. This challenge which bore the inviting name of Break Our Watermarking System BOWS had as its main objective to enlarge the current knowledge on attacks to watermarking systems. In this paper the main results obtained by the authors when attacking the BOWS system are presented and compared with strategies followed by other groups. Essentially two different approaches have been followed exhaustive search of the secret key and blind sensitivity attacks. Copyright 2007 P. Comesana and F. Perez-Gonzalez. 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 In the last decade with the spreading of the Internet as an impressive communication tool and the appearance of advanced editing tools which can be used by almost any nontrained user the need of new technical solutions to the problems of copyright protection authentication fingerprinting or annotation of digital contents has soared. Digital watermarking has been widely recognized as a potentially powerful instrument against piracy illegal modification or improper use of contents. .
