@misc{cryptoeprint:2008:189,
    author = {Thomas Ristenpart and Thomas Shrimpton},
    title = {How to Build a Hash Function from any Collision-Resistant Function},
    howpublished = {Cryptology ePrint Archive, Report 2008/189},
    year = {2008},
    url = {http://eprint.iacr.org/2008/189},
}