@misc{cryptoeprint:2021:898,
    author = {Vasyl Ustimenko},
    title = {On Extremal Expanding Algebraic Graphs and post-quantum secure delivery of passwords,  encryption maps and tools for multivariate digital signatures.                 },
    howpublished = {Cryptology ePrint Archive, Report 2021/898},
    year = {2021},
    url = {https://eprint.iacr.org/2021/898},
}