Cryptology ePrint Archive: BibTeX Citation of Report 2009/123

@misc{cryptoeprint:2009:123,
    author = {N. A. Carella, CUNY, N.Y.},
    title = {On the Complexity of Integer Factorization},
    howpublished = {Cryptology ePrint Archive, Report 2009/123},
    year = {2009},
    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.