Countermeasures for collusion attacks exploiting host signal redundancy

Multimedia digital data is highly redundant: successive video
frames are very similar in a movie clip, most songs contain some repetitive
patterns, etc. This property can consequently be exploited to successively
replace each part of the signal with a similar one taken from
another location in the same signal or with a combination of similar
parts. Such an approach is all the more pertinent when video content
is considered since such signals exhibit both temporal and spatial selfsimilarities.
To counter such attacking strategies, it is necessary to ensure
that embedded watermarks are coherent with the redundancy of the host
content. To this end, both motion-compensated watermarking and selfsimilarities
inheritance will be surveyed.