Decentralized Multi-Authority (Attribute-Based) Traitor Tracing (opens in new tab)

We initiate the study of multi-authority traitor tracing \(MA-TT\), a decentralized variant of traitor tracing in which tracing capabilities are distributed across multiple independent authorities rather than concentrated in a single trusted entity\. Ciphertexts are associated with tracing policies over a collection of authorities, specifying which subsets of authorities are authorized to jointly accuse a user of contributing to a pirate decoder\. This enables fine-grained control over tracin...