Cryptology ePrint Archive: BibTeX Citation of Report 2015/223

@misc{cryptoeprint:2015:223,
    author = {Anubhab Baksi and Subhamoy Maitra and Santanu Sarkar},
    title = {New Distinguishers for Reduced Round Trivium and Trivia-SC using Cube Testers},
    howpublished = {Cryptology ePrint Archive, Report 2015/223},
    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.