Cryptology ePrint Archive: BibTeX Citation of Report 2005/104

@misc{cryptoeprint:2005:104,
    author = {Nick Howgrave-Graham and Jeff Hoffstein and Jill Pipher and William Whyte},
    title = {On estimating the lattice security of NTRU},
    howpublished = {Cryptology ePrint Archive, Report 2005/104},
    year = {2005},
    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.