Cryptology ePrint Archive: BibTeX Citation of Report 2015/520

@misc{cryptoeprint:2015:520,
    author = {Suvradip Chakraborty, Y. Sreenivasarao, C. Pandu Rangan, Srinivasan Raghuraman},
    title = {A Constant Time, Single Round, Attribute-Based Authenticated Key Exchange in Random Oracle Model},
    howpublished = {Cryptology ePrint Archive, Report 2015/520},
    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.