Cryptology ePrint Archive: BibTeX Citation of Report 2003/151

@misc{cryptoeprint:2003:151,
    author = {Jaume Martí-Farré and Carles Padró},
    title = {Secret sharing schemes on sparse homogeneous access structures with rank three},
    howpublished = {Cryptology ePrint Archive, Report 2003/151},
    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.