Cryptology ePrint Archive: BibTeX Citation of Report 2003/019

@misc{cryptoeprint:2003:019,
    author = {Jung Hee Cheon and Byungheup Jun},
    title = {A Polynomial Time Algorithm for the Braid Diffie-Hellman Conjugacy Problem},
    howpublished = {Cryptology ePrint Archive, Report 2003/019},
    year = {2003},
    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.