Cryptology ePrint Archive: BibTeX Citation of Report 2015/541

@misc{cryptoeprint:2015:541,
    author = {Bart Mennink and Reza Reyhanitabar and Damian Vizár},
    title = {Security of Full-State Keyed Sponge and Duplex: Applications to Authenticated Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2015/541},
    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.