These proceedings contain the 25 papers that were accepted for presentation at the Eighth Information Hiding Conference, held July 10-12, 2006 in Old Town Alexandria, Virginia. The paperswere selectedby the ProgramCommittee from more than 70 submissions on the basis of their novelty, originality, and scienti?c merit. We aregratefulto allauthorswho submitted their workforconsideration. The papers were divided into ten sessions [Watermarking, Information Hiding and Networking, Data Hiding in Unusual Content (2 sessions), Fundamentals, Software Protection, Steganalysis, Steganography (2 sessions), and Subliminal Channels], showing the breadth of research in the?eld. This year was an imp- tant one in the history of the IHW: "Workshop" was dropped from the name to show that the?eld has matured andthat the conference has become the premier venue for the dissemination of new results. The conference employed a double-blind reviewing process. Each paper was examined by at least three reviewers. Papers submitted by ProgramCommittee members were held to a higher standard. We relied on the advice of outside colleagues and would like to extend our thanks for their contribution to the paper selection process and their dedication to excellence in research.