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Cryptanalysis of a Wavelet Based Watermarking Scheme

  • Tanmoy Kanti Das
  • Jianying Zhou
  • Subhamoy Maitra
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3304)

Abstract

In this paper we cryptanalyze the wavelet based watermarking scheme by Wang et al, 2002. By cryptanalysis we mean the removal of the watermark using a single watermarked copy which is equivalent to cipher text only jamming attack. The watermark embedding process replaces a particular middle frequency band of the host image (in wavelet domain) with the watermark. In the scheme, the key consists of three secrets: (i) the watermark, (ii) the random filter bank used for wavelet transform and (iii) the wavelet band where the watermark is inserted. First we observe that the secret random filter bank does not provide any security since it can be replaced by any filter bank from a large class. Further, it is possible to discover the secret wavelet band used to watermark the host image. Though in cryptography the random nature of secret key provides the security, in contrary here we show that the random nature of the watermark actually helps in identifying the secret wavelet band and consequently one can remove the watermarking signal from that band to mount the successful cryptanalytic attack.

Keywords

Correlation Cryptanalysis Digital Watermarking Wavelet Transform 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Tanmoy Kanti Das
    • 1
  • Jianying Zhou
    • 2
  • Subhamoy Maitra
    • 1
  1. 1.Applied Statistics UnitIndian Statistical InstituteCalcuttaIndia
  2. 2.Infocomm Security DepartmentInstitute for Infocomm ResearchSingapore

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