Cryptology ePrint Archive: BibTeX Citation of Report 2012/450

@misc{cryptoeprint:2012:450,
    author = {Will Landecker and Thomas Shrimpton and R. Seth Terashima},
    title = {Tweakable Blockciphers with Beyond Birthday-Bound Security},
    howpublished = {Cryptology ePrint Archive, Report 2012/450},
    year = {2012},
    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.