Cryptology ePrint Archive: BibTeX Citation of Report 2015/079

@misc{cryptoeprint:2015:079,
    author = {Jiqiang Lu},
    title = {On the Security of the COPA and Marble Authenticated Encryption Algorithms against (Almost) Universal Forgery Attack},
    howpublished = {Cryptology ePrint Archive, Report 2015/079},
    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.