Cryptology ePrint Archive: BibTeX Citation of Report 2013/570

@misc{cryptoeprint:2013:570,
    author = {Jun Shao and Licheng Wang and Xiaolei Dong and Zhenfu Cao },
    title = {New Efficient Identity-Based Encryption From Factorization},
    howpublished = {Cryptology ePrint Archive, Report 2013/570},
    year = {2013},
    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.