@misc{cryptoeprint:2010:519,
    author = {Matthias Krause and Frederik Armknecht and Ewan Fleischmann},
    title = {Preimage Resistance Beyond the Birthday Bound: Double-Length Hashing Revisited},
    howpublished = {Cryptology ePrint Archive, Report 2010/519},
    year = {2010},
    url = {http://eprint.iacr.org/2010/519},
}