Cryptology ePrint Archive: BibTeX Citation of Report 2015/650

@misc{cryptoeprint:2015:650,
    author = {Roman Oliynykov and Ivan Gorbenko and Oleksandr Kazymyrov and Victor Ruzhentsev and Oleksandr Kuznetsov and Yurii Gorbenko and Oleksandr Dyrda and Viktor Dolgov and Andrii Pushkaryov and Ruslan Mordvinov and Dmytro Kaidalov},
    title = {A New Encryption Standard of Ukraine: The Kalyna Block Cipher},
    howpublished = {Cryptology ePrint Archive, Report 2015/650},
    year = {2015},
    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.