Cryptology ePrint Archive: BibTeX Citation of Report 2014/848

@misc{cryptoeprint:2014:848,
    author = {Nicolas T. Courtois and Pinar Emirdag and Filippo Valsorda},
    title = {Private Key Recovery Combination Attacks: On Extreme Fragility of Popular Bitcoin Key Management, Wallet and Cold Storage Solutions in Presence of Poor RNG Events},
    howpublished = {Cryptology ePrint Archive, Report 2014/848},
    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.