Cryptology ePrint Archive: BibTeX Citation of Report 2006/356

@misc{cryptoeprint:2006:356,
    author = {Emilia K\"{a}sper and Sven Laur and Helger Lipmaa},
    title = {Black-Box Knowledge Extraction Revisited: Universal Approach with Precise Bounds},
    howpublished = {Cryptology ePrint Archive, Report 2006/356},
    year = {2006},
    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.