@misc{cryptoeprint:2015:151,
    author = {Daniel J. Bernstein and Andreas Hülsing and Tanja Lange and Ruben Niederhagen},
    title = {Bad directions in cryptographic hash functions},
    howpublished = {Cryptology ePrint Archive, Report 2015/151},
    year = {2015},
    url = {https://eprint.iacr.org/2015/151},
}