Image-based Digital Fingerprinting Technology Research

Recent years, digital fingerprinting is regarded more and more important, and we also have much research production, but in our country, seen from the open information, digital fingerprinting is not regarded enough. In general, the research is just started and its application is localized. However with the importance of copy protection, digital fingerprinting will be much more regarded. In this paper we focus on researching the algorithm of collusion-resistant digital fingerprints. Following are the main results of this paper:Simply introduce the concept and example of digital fingerprinting, explain the correlative term and model, sum up and analyze the research production, then introduce several classical scheme of digital fingerprinting and some attack measures. At last we compare the difference between digital fingerprinting and digital watermark.Based on the embedding assumption, design a 2-secure fingerprints using concatenated codes and its corresponding tracing algorithm.This code can also trace at least one traitor on the situation that with the increasing of users but no increasing of the length of codes, such property of the codes solve the shortcomings of long codes before.Based on the excellent properties of chaotic sequence's auto-correlation and cross-correlation, this paper provide an algorithm using binary chaotic sequence as fingerprints and spread spectrum technology to embed fingerprints. This algorithm can not only resist watermark attack, but also can resist collusion attack. Because a chaotic sequence is corresponding to a chaotic initial, the merchant can only reserve the initial, unnecessary to reserve the whole sequence, solving the difficult problem of digital fingerprints.