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Universal threshold calculation for fingerprinting decoders using mixture models

: Schäfer, Marcel; Mair, Sebastian; Berchtold, Waldemar; Steinebach, Martin


Alattar, A. ; Association for Computing Machinery -ACM-:
IH&MMSec 2015, 3rd ACM Workshop on Information Hiding and Multimedia Security. Proceedings : Portland, OR, USA, June 17 - 19, 2015
New York: ACM, 2015
ISBN: 978-1-4503-3587-4
Workshop on Information Hiding and Multimedia Security (IH&MMSec) <3, 2015, Portland/Or.>
Conference Paper
Fraunhofer SIT ()

Collusion attacks on watermarked media copies are commonly countered by probabilistically generated fingerprinting codes and appropriate tracing algorithms. The latter calculates accusation scores representing the suspiciousness of the fingerprints. In a 'detect many' scenario a threshold decides which scores are associated to the colluders. This work proposes a universal method to calculate thresholds for different decoders solely with knowledge of the accusation scores from the actual attack. Applying mixture models on the scores, the threshold is set up satisfying the selected error probabilities. It is independent from the fingerprint generation and can be applied at any decoder. Also no knowledge about the number of attackers or their strategy is needed.