@misc{cryptoeprint:2007:229,
    author = {Ueli Maurer and Stefano Tessaro},
    title = {Domain Extension of Public Random Functions: Beyond the Birthday Barrier},
    howpublished = {Cryptology ePrint Archive, Report 2007/229},
    year = {2007},
    url = {http://eprint.iacr.org/2007/229},
}