Towards practical joint decoding of binary Tardos fingerprinting codes

Peter Meerwald (1) , Teddy Furon (1)

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The class of joint decoder of fingerprinting codes is of utmost importance in theoretical papers to establish the concept of fingerprint capacity [1][4]. However, no implementation supporting a large user base is known to date. This article presents an iterative decoder which is the first attempt towards practical large-scale joint decoding. The discriminative feature of the scores benefits on one hand from the side-information of previously found users, and on the other hand, from recently introduced universal linear decoders for compound channels [5]. Neither the code construction nor the decoder make assumptions about the collusion size and strategy, provided it is a memoryless and fair attack. The extension to incorporate soft outputs from the watermarking layer is straightforward. An extensive experimental work benchmarks the very good performance and offers a clear comparison with previous state-of-the-art decoders

Keywords: Index Terms-Compound channel; fingerprinting; Tardos codes; traitor tracing

Domains: Signal and Image Processing; Signal and Image processing

Peter Meerwald, Teddy Furon. Towards practical joint decoding of binary Tardos fingerprinting codes. IEEE Transactions on Information Forensics and Security, 2012, 7 (4), pp.1168-1180. ⟨10.1109/TIFS.2012.2195655⟩. ⟨hal-00740964⟩