Threshold Traitor Tracing Revisited: Insider Attacks and Multi-Traitor Tracing

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Threshold traitor tracing [Boneh et al., Crypto’24] enhances threshold decryption with anti-collusion guarantees via a tracing mechanism. In this model, a set of colluders constructs a decryption box, called a decoder, and sells it to an external buyer. Collusion-resilience is guaranteed by a tracing algorithm that, given only black-box access to the decoder, can identify at least one of the colluders. Since its introduction, threshold traitor tracing has attracted significant attention, leadin