Cryptology ePrint Archive: BibTeX Citation of Report 2004/123

@misc{cryptoeprint:2004:123,
    author = {Dong-Guk Han and Jongin Lim and Kouichi Sakurai},
    title = {On security of XTR public key cryptosystems against Side Channel Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2004/123},
    year = {2004},
    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.