@misc{cryptoeprint:2018:610,
    author = {Constantin-Catalin Dragan and Daniel Gardham and Mark Manulis},
    title = {Hierarchical Attribute-based Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2018/610},
    year = {2018},
    url = {https://eprint.iacr.org/2018/610},
}