Abdelkader Ouda and Mahmoud R. El-Sakka, "A Practical Version
of Wong's Watermarking Technique", IEEE International
Conference on Image Processing, ICIP'2004, pp. 2615 - 2618,
October 2004, Suntec City, Singapore.
Abstract
In this paper, we study the security of Wong's technique. It
is shown that the technique is vulnerable to cryptographer's
attacks. This is due to the use of short keys within the
public-key cryptosystem. Short keys are used in Wong's
technique to make the watermark small enough to fit in an
image block. This paper proposes an elegant solution that
helps Wong's technique to be practically implemented. A new
method of applying the cryptographic hash function is
utilized. This method makes the image blocks able to hold
longer and secure watermarks while providing similar level of
the localization accuracy. The experimental results show that
the proposed solution carries Wong's technique from a
cryptographically vulnerable system to a secure and practical
one.