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Hierarchical Spread Spectrum Fingerprinting Scheme Based on the CDMA Technique

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Author(s): Kuribayashi Minoru

Journal: EURASIP Journal on Information Security
ISSN 1687-4161

Volume: 2011;
Issue: 1;
Start page: 502782;
Date: 2011;
Original page

ABSTRACT
Abstract Digital fingerprinting is a method to insert user's own ID into digital contents in order to identify illegal users who distribute unauthorized copies. One of the serious problems in a fingerprinting system is the collusion attack such that several users combine their copies of the same content to modify/delete the embedded fingerprints. In this paper, we propose a collusion-resistant fingerprinting scheme based on the CDMA technique. Our fingerprint sequences are orthogonal sequences of DCT basic vectors modulated by PN sequence. In order to increase the number of users, a hierarchical structure is produced by assigning a pair of the fingerprint sequences to a user. Under the assumption that the frequency components of detected sequences modulated by PN sequence follow Gaussian distribution, the design of thresholds and the weighting of parameters are studied to improve the performance. The robustness against collusion attack and the computational costs required for the detection are estimated in our simulation.
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