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: IResearch Article Logistic Map-Based Fragile Watermarking for Pixel Level Tamper Detection and Resistance | Hindawi Publishing Corporation EURASIP Journal on Information Security Volume 2010 Article ID 829516 7 pages doi 2010 829516 Research Article Logistic Map-Based Fragile Watermarking for Pixel Level Tamper Detection and Resistance Shan Suthaharan Department of Computer Science University of North Carolina at Greensboro Greensboro NC 27402 USA Correspondence should be addressed to Shan Suthaharan ssuthaharan@ Received 21 April 2010 Revised 7 August 2010 Accepted 23 September 2010 Academic Editor Miroslav Goljan Copyright 2010 Shan Suthaharan. 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. An efficient fragile image watermarking technique for pixel level tamper detection and resistance is proposed. It uses five most significant bits of the pixels to generate watermark bits and embeds them in the three least significant bits. The proposed technique uses a logistic map and takes advantage of its sensitivity property to a small change in the initial condition. At the same time it incorporates the confusion diffusion and hashing techniques used in many cryptographic systems to resist tampering at pixel level as well as at block level. This paper also presents two new approaches called nonaggressive and aggressive tamper detection algorithms. Simulations show that the proposed technique can provide more than tamper detection capability with less than false-positive detection andlessthan false-negative detection responses. 1. Introduction Fragile image watermarking has been proposed to authenticate digital images and detect tampering. In general watermarks are generated from the most significant bits MSB and then embedded into the least significant bits LSB of the pixels while maintaining the image quality. The fragile image watermarking schemes also provide a procedure or rules to
