Cryptology ePrint Archive: BibTeX Citation of Report 2005/232

@misc{cryptoeprint:2005:232,
    author = {Markus Volkmer and Sebastian Wallner},
    title = {Lightweight Key Exchange and Stream Cipher based solely on Tree Parity Machines},
    howpublished = {Cryptology ePrint Archive, Report 2005/232},
    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.