Watermarking scheme for secure image authentication in wavelet domain
| Year | Start Page | End Page |
|---|---|---|
2006 | 102 | 106 |
Tobulėjant informacinėms technologijoms kyla vis didesnis autentiškumo praradimo pavojus. Straipsnyje pasiūlytas vaizdų autentiškumo užtikrinimo dažninėje srityje algoritmas. Jame realizuoti mechanizmai leidžia patikrinti autentiškumų ir surasti pažeistas vietas. Eksperimentiniai rezultatai patvirtina, kad siūlomas metodas turi gerą tikslumą nustatant pakeistus pikselius ir suteikia galimybę atstatyti pažeistas vietas.
In today's society is very important to assure information safety and authenticity. Cryptography is not capable of providing adequate solutions to ensure authenticity of graphical images. Furthermore, images can be forgered using the capabilities of a casual home computer. Defense against such attacks is possible through the use of image watermarking[1]. Digital watermarking is a technique to insert a digital signature into an image so that the signature can be extracted for the purposes of ownership verification and/or authentication. The fundamental idea is that watermark has to be integrated with mainstream of the image in such a way, that it would be impossible to remove the watermark without total destruction of the image. In this paper we examine generalized model of all known pixel-wise schemes and the most effective watermarking algorithm attack, so-called "oracle attack". A new watermarking technique is proposed that has separate mechanisms for authenticity verification and tamper localization, designed to withstand oracle attack. This approach exploits the advantages of the wavelet transformation.