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Open Access Research Article

Hierarchical Spread Spectrum Fingerprinting Scheme Based on the CDMA Technique

Minoru Kuribayashi

Author Affiliations

Graduate School of Engineering, Kobe University, 1-1, Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan

EURASIP Journal on Information Security 2011, 2011:502782  doi:10.1155/2011/502782

The electronic version of this article is the complete one and can be found online at: http://jis.eurasipjournals.com/content/2011/1/502782


Received:10 March 2010
Revisions received:15 December 2010
Accepted:20 January 2011
Published:6 February 2011

© 2011 Minoru Kuribayashi.

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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