Cryptology ePrint Archive: BibTeX Citation of Report 2007/393

@misc{cryptoeprint:2007:393,
    author = {Haining Fan and Jiaguang Sun and Ming Gu and Kwok-Yan Lam},
    title = {Overlap-free Karatsuba-Ofman Polynomial Multiplication Algorithms},
    howpublished = {Cryptology ePrint Archive, Report 2007/393},
    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.