@misc{cryptoeprint:2019:686,
    author = {Nir Bitansky and Akshay Degwekar},
    title = {On the Complexity of Collision Resistant Hash Functions: New and Old Black-Box Separations},
    howpublished = {Cryptology ePrint Archive, Report 2019/686},
    year = {2019},
    url = {https://eprint.iacr.org/2019/686},
}