A Study on Combinatorial Traitor Tracing Schemes for Broadcast Encryption

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Traitor tracing is a mathematical approach of protecting copyright of digital content against collusion attacks. This project studies combinatorial secure codes for traitor tracing, with particular focus on exploring their maximum code rate and identifying algorithms. The obtained results are as follows. 1) A new unified concept of secure codes with list decoding (SCLDs) is proposed by integrating the idea of list decoding into secure codes with complete traceability; 2) Bounds on the maximum code rate of SCLDs are derived via the probabilistic method; 3) A two-step decoding algorithm is established for SCLDs, whose efficiency outperforms the known separable codes; 4) A two-stage dynamic framework is proposed for dynamic traitor tracing; 5) New bounds on the maximum code rate of binary multimedia IPP codes are established.