Resmi K. Rajan, Deepthi P. Pattathil, and Sudhish N. George
Digital Fingerprinting, LDPC Codes, Colluder Detection
Nowadays, several illegal manipulations are performed on the multimedia data, which are available on the internet. Malpractitioners remove the contents used for authentication, so that they can distribute it freely. So a scheme popularly known as fingerprinting was introduced to identify the illegal distributor. In this technique, for authenticity, a unique code is given to each person. The distributor can be identified by extracting the fingerprint from the illegally distributed media. Defaulters try to disturb the fingerprint by combining their fingerprinted copies. Such an attack is termed as collusion. Here we propose a new code system for fingerprinting, based on low density parity check (ldpc) codes. Even though ldpc codes are very popular as error correcting codes, their performance as fingerprint codes are never studied before. The proposed system is compared with fingerprinting based on bibd codes in terms of database capacity and robustness. Analysis shows that the proposed system outperforms bibd based systems by a good margin.
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