@misc{cryptoeprint:2020:1156,
    author = {Anna Lisa Ferrara and Chiara Ricciardi},
    title = {Verifiable Hierarchical Key Assignment Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2020/1156},
    year = {2020},
    url = {https://eprint.iacr.org/2020/1156},
}