Security

On Error-Correcting Fingerprinting Codes for Use With Watermarking

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Executive Summary

Digital fingerprinting has been suggested for copyright protection. Using a watermarking scheme, a fingerprint identifying the buyer is embedded in every copy sold. If an illegal copy appears, it can be traced back to the guilty user. By using collusion-secure codes, the fingerprinting system is made secure against cut-and-paste attacks. In this paper, the authors study the interface between the collusion-secure fingerprinting codes and the underlying watermarking scheme, and they construct several codes which are both error-correcting and collusion-secure. Error-correction makes the system robust against successful attacks on the watermarking layer.

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