20.500.12556/RUL-91125 Odpornost zvočnega vodnega žiga na napade Audio watermark attack resilience Zaradi velikih finančnih izgub, ki jih povzroča nezakonito širjenje avtorskih del, je potreba po tehnologiji, ki bi jih uspešno zaščitila, velika. V diplomskem delu sem se osredotočil na robustni zvočni vodni žig in njegovo odpornost na napade. Predstavil sem orodja za vodno žigosanje, detekcijo vodnih žigov in napade nanje. Orodja sem preizkusil na treh različnih zvočnih posnetkih, katerim sem vrinil vodni žig. Ugotovil sem, da dodani vodni žig nosilni signal izraziteje popači pri govoru. Pri glasbi, posebej klasični, je popačenje skoraj zanemarljivo. Te vodne žige sem nato napadal s šumom, izgubnim transkodiranjem, spreminjanjem hitrosti in višine predvajanja ter z analogno zanko kanala. Pred in po napadih sem ocenil zaznavno popačenje zvoka in na podlagi ocen določil najučinkovitejše napade. Ugotovil sem, da na napade s spreminjanjem hitrosti in višine ločeno ali sorazmerno, vendar z višjo intenzivnostjo, ni dovolj odporen. To se je pokazalo kot velika varnostna luknja, saj je s takim napadom mogoče ohraniti relativno kakovosten posnetek, pri tem pa vodni žig razbiti. Smiselnost zvočnega vodnega žiga za zaščito avtorskih pravic sem zaradi slabe odpornosti na določene napade, relativno zaznavnega popačenja zvoka in težkega dokazovanja kršitev označil kot vprašljivo. Due to the large financial losses caused by illegal distribution of copyrighted materials, there is a strong necessity for the technology that would prevent such actions. In my diploma thesis I focused on the robust audio watermark and its resilience to attacks. I have described the tools for watermarking, watermark detection and watermark attacks. I tested the tools on three different, previously watermarked audio tracks. Thus I found out, that by embedding watermark, the distortion of the carrier signal is more significant in speech, while in music, especially classical, the distortion is almost negligible. Then I attacked those watermarks by noise, lossy transcoding, playback speed and pitch changing, as well as by analog loop channel. On the basis of estimates of the detectable audio distortion, which I carried out before and after the attacks, I was able to determine the most effective attacks. I also realised that the watermark is not resilient enough against attacks with the method of changing speed and pitch separately or proportionally, but with higher intensity. It turned out to be a big security hole, since after any such attack it is possible to preserve a relatively high-quality of audio track and to destroy watermark at the same time. I tagged the reasonableness of the watermark as questionable, because of the bad resilience to certain attacks, relatively detectable audio distortion and difficult infringement proving. avdio zvočni vodni žig napad AWT2 Reaper avtorske pravice zaščita audio sound watermark attack AWT2 Reaper copyright protection true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2017-03-21 13:15:06 2017-03-21 13:15:08 2022-08-09 21:14:09 0000-00-00 00:00:00 2017 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 37401 Isovski_Dominik_-_Odpornost_zvocnega_vodnega_ziga_na_napade.pdf Isovski_Dominik_-_Odpornost_zvocnega_vodnega_ziga_na_napade.pdf 1 F1C96B1AF98E8BA1D8E34B66622F00A4 fa5b8dae0dd54f459c1e0e918e02f43a08fdaf3ea9d67a3164a89a7443c7af2c df6e3cc0-a1b1-11eb-a523-00155dcfd717 20.500.12556/rul/87aeec3c-2231-41e8-842e-030853327565 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=94739 Fakulteta za elektrotehniko 0 0 0