@misc{cryptoeprint:2014:752,
    author = {Arcangelo Castiglione and Alfredo De Santis and Barbara Masucci},
    title = {Key Indistinguishability vs. Strong Key Indistinguishability for Hierarchical Key Assignment Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2014/752},
    year = {2014},
    url = {https://eprint.iacr.org/2014/752},
}