Cryptology ePrint Archive: BibTeX Citation of Report 2014/158

@misc{cryptoeprint:2014:158,
    author = {Elisa Gorla and Maike Massierer},
    title = {Point compression for the trace zero subgroup over a small degree extension field},
    howpublished = {Cryptology ePrint Archive, Report 2014/158},
    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.