@misc{cryptoeprint:2011:210,
    author = {Jooyoung Lee and Martijn Stam and John Steinberger},
    title = {The preimage security of double-block-length compression functions},
    howpublished = {Cryptology ePrint Archive, Report 2011/210},
    year = {2011},
    url = {http://eprint.iacr.org/2011/210},
}