@misc{cryptoeprint:2020:146,
    author = {Roman Langrehr and Jiaxin Pan},
    title = {Hierarchical Identity-Based Encryption with Tight Multi-Challenge Security},
    howpublished = {Cryptology ePrint Archive, Report 2020/146},
    year = {2020},
    url = {https://eprint.iacr.org/2020/146},
}