Collusion-resistant fingerprints from WBE sequence sets

Digital fingerprinting protects multimedia content from being used for unauthorized purposes. One cost-effective strategy to attack digital fingerprints is collusion, where several colluders average their individual copies to disrupt the underlying fingerprints. In this work, we propose that fingerprints can be constructed using sequence sets satisfying the Welch bound equality (WBE). We further propose a detection algorithm utilizing sphere decoding that identifies the colluders from the colluded signal. We evaluate the performance of the proposed WBE-based anti-collusion codes (ACC) fingerprints with our proposed detection algorithm through simulations, and compare the performance of our scheme against orthogonal fingerprints and the BIBD anti-collusion codes proposed earlier. Simulation results show that the proposed WBE-based ACC and detection algorithm have better performance than BIBD-based ACC under the same configuration.