Title:
FromWeaktoStrongWatermarking
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Description: The informal goal of a watermarking scheme is to “mark” a digital object, such as a
picture
or video, in such a way that it is difficult for an adversary to remove the mark without
destroying the
content of the object. Although there has been considerable work proposing and breaking
watermarking
schemes, there has been little attention given to the formal security goals of such a
scheme. In this work,
we provide a new complexity-theoretic definition of security for watermarking schemes. We
describe
some shortcomings of previous attempts at defining watermarking security, and show that
security under
our definition also implies security under previous definitions. We also propose two weaker
security
conditions that seem to capture the security goals of practice-oriented work on
watermarking and show
how schemes satisfying these weaker goals can be strengthened to satisfy our definition.
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From Weak to Strong Watermarking.pdf
