Cryptology ePrint Archive: BibTeX Citation of Report 2014/684

@misc{cryptoeprint:2014:684,
    author = {Antonio de la Piedra and Jaap-Henk Hoepman and Pim Vullers},
    title = {Towards a Full-Featured Implementation of Attribute Based Credentials on Smart Cards},
    howpublished = {Cryptology ePrint Archive, Report 2014/684},
    year = {2014},
    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.