Cryptology ePrint Archive: BibTeX Citation of Report 2012/558

@misc{cryptoeprint:2012:558,
    author = {Jens Bender and Özgür Dagdelen and Marc Fischlin and Dennis Kügler},
    title = {Domain-Specific Pseudonymous Signatures for the German Identity Card},
    howpublished = {Cryptology ePrint Archive, Report 2012/558},
    year = {2012},
    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.