Cryptanalysis of an improved fragile watermarking scheme

Daniel Caragata*, Juan Andres Mucarquer, Mirko Koscina, Safwan El Assad

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)


This paper presents two attacks on Teng et al.'s fragile watermarking algorithm. Both attacks allow the attacker to apply valid watermarks on tampered images, therefore rendering the watermarking scheme useless. The first attack uses the watermarked version of two chosen images, and the second attack, a generalization of the first, uses a number of arbitrary watermarked images. The paper also models the cryptanalysis process for the second attack using Markov chains in order to demonstrate that the necessary number of images is relatively small for a high probability of successful attack. All the results that are presented in this paper have been confirmed by a practical implementation.

Original languageEnglish
Pages (from-to)777-785
Number of pages9
JournalAEU - International Journal of Electronics and Communications
Issue number6
Publication statusPublished - Jun 2016
Externally publishedYes


  • fragile watermarking
  • cryptanalysis
  • Markov chains
  • multimedia security
  • chaotic functions

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