攻撀一個基於離散小波轉換的浮水印技術

Attacks on a DWT-Based Watermarking Scheme

孫振東(J. D. Sun) ； 周立平(L. P. Chou) ； 陳俊榮(C. J. Chen) ； 楊泰寧(T. N. Yang)

《華岡工程學報》 25期 (2010/01) Pp. 51-57

https://doi.org/10.29987/CCUHKJE.201001.0008

摘要

一般而言，浮水印技術必須具備浮水印不易被攻擊者移除的特性，本論文對Inoue等人提出之「離散小波轉換為基礎之數位浮水印技術」進行研究[9]，且證明其技術並非安全，我們的攻擊方法包含兩個階段：在第一階段，將藏有浮水印的圖做小波轉換，藉由轉換係數之零樹根(zerotree's root)的搜尋以偵測浮水印位置，接著在第二階段將偵測到的浮水印移除或取代。本論文亦提出一改良的浮水印方法，經模擬結果顯示本技術可以對抗各種訊號處理攻擊。

關鍵字

數位浮水印 ； 離散小波轉換

並列摘要

In general, a digital watermark technique must satisfy that the embedded watermark is difficult for an attacker to remove. In this paper, we study a DWT-based watermarking scheme by Inoue et al. [9] and show their scheme is insecure. Our attack consists of two stages: In the first stage, we show that the watermark can be detected by finding the position of zerotree's root after the wavelet transform of the watermarked image. Then in the second stage, we show the embedded watermark can be removed or replaced. In this paper, we also propose an improved method of digital watermark. Simulation results show the proposed method is robust against various signal-processing attacks.

並列關鍵字

digital watermarking ； DWT