Cryptology ePrint Archive: BibTeX Citation of Report 2015/266

@misc{cryptoeprint:2015:266,
    author = {Xianrui Meng and Seny Kamara and Kobbi Nissim and George Kollios},
    title = {GRECS: Graph Encryption for Approximate Shortest Distance Queries},
    howpublished = {Cryptology ePrint Archive, Report 2015/266},
    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.