@misc{cryptoeprint:2020:181,
    author = {Kohei Nakagawa and Hiroshi Onuki and Atsushi Takayasu and Tsuyoshi Takagi},
    title = {$L_1$-Norm Ball for CSIDH: Optimal Strategy for Choosing the Secret Key Space},
    howpublished = {Cryptology ePrint Archive, Report 2020/181},
    year = {2020},
    url = {https://eprint.iacr.org/2020/181},
}