@misc{cryptoeprint:2018:640,
    author = {Masayuki Abe and Miguel Ambrona and Miyako Ohkubo and Mehdi Tibouchi},
    title = {Lower Bounds on Structure-Preserving Signatures for Bilateral Messages},
    howpublished = {Cryptology ePrint Archive, Report 2018/640},
    year = {2018},
    url = {https://eprint.iacr.org/2018/640},
}