Cryptology ePrint Archive: BibTeX Citation of Report 2007/249

@misc{cryptoeprint:2007:249,
    author = {Serge Fehr and Christian Schaffner},
    title = {Randomness Extraction via Delta-Biased Masking in the Presence of a Quantum Attacker},
    howpublished = {Cryptology ePrint Archive, Report 2007/249},
    year = {2007},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.