Security

A Lattice-Based Traitor Tracing Scheme

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Executive Summary

A traitor tracing scheme is a multi-receiver encryption scheme where malicious receiver coalitions aiming at building pirate decryption devices are deterred by the existence of a tracing algorithm: using the pirate decryption device, the tracing algorithm can recover at least one member of the malicious coalition. All existing traitor tracing schemes rely either on rather inefficient generic constructions from arbitrary encryption schemes and collusion-secure fingerprinting codes, or on algebraic constructions exploiting the assumed hardness of variants of the Discrete Logarithm Problem. In this paper, the authors present the first algebraic construction of a traitor tracing encryption scheme whose security relies on the assumed (quantum) worst-case hardness of standard lattice problems.

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