Cryptology ePrint Archive: BibTeX Citation of Report 2010/013

@misc{cryptoeprint:2010:013,
    author = {Orr Dunkelman and Nathan Keller and Adi Shamir},
    title = {A Practical-Time Attack on the A5/3 Cryptosystem Used in Third Generation GSM Telephony},
    howpublished = {Cryptology ePrint Archive, Report 2010/013},
    year = {2010},
    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.