Abstract:
The ambiguity attack, or invertibility attack, was
discovered in 1998 as a simple but a powerful attack against
digital watermarking schemes. Identifying the potential threat of
this attack, a number of ambiguity attack resistant watermarking
schemes have been proposed in the past literature. However, later
on some of these schemes were proven to be failing under the
ambiguity attack. In this paper, we study the concept of the
ambiguity attack, evaluate different ambiguity attack resistant
watermarking schemes and the scenarios under which they fail
to provide necessary security against ambiguity attacks. We
employ the secure spread spectrum method as the underlying
watermarking scheme to implement and evaluate these ambiguity
attack resistant watermarking schemes.
