Cryptology ePrint Archive: BibTeX Citation of Report 2014/107

@misc{cryptoeprint:2014:107,
    author = {Joel Alwen and Martin Hirt and Ueli Maurer and Arpita Patra and Pavel Raykov},
    title = {Key-Indistinguishable Message Authentication Codes},
    howpublished = {Cryptology ePrint Archive, Report 2014/107},
    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.