Non-monotonic Practical ABE with Direct Revocation, Blackbox Traceability, and a Large Attribute Universe
We selected Liu et al.’s “Augmented R-CP-ABE” scheme [1, 2] as the technical foundation for a data encryption service. In the course of the requirements analysis it turned out that the property of the non-monotonic access structures is needed, but is not provided by Liu’s original scheme. This work uses the techniques introduced by Yamada et al. in [3] which build on top of Ostrovsky et al. [4] to retrofit the property of the non-monotonic access structure, as it was already outlined by Thatmann in [5]. The remainder is structured as follows: we start with an overview of terms and symbols in Section 2.1. New required computations to archive the non-monotonic property and blackbox traceability property are subject of Section 3 and 4. An evaluation is given in Section 5.