Multimedia Content Tracing Scheme Based on Tardos' Fingerprint Codes

Tardos constructed the optimal probabilistic codes that are ε-secure against c pirates have length O(c
²
log(1/ε)) and are full power of randomization. Many improved versions of Tardos' codes are proposed to shorten its code length while they are still not used in multimedia content. In this paper, the multimedia content tracing scheme based on the Tardos' fingerprint codes is proposed. Before embedding/extracting the Tardos' in the multimedia content, the fingerprint bit is modulated/demodulated with spread-spectrum modulation and quantization-index modulation. The collusion resistance of the Tardos' fingerprint based on the different watermark modulation techniques is analyzed. Simulation results show that based on different watermarking modulation technique the collusion resistance of Tardos' fingerprint is different.