Cryptology ePrint Archive: BibTeX Citation of Report 2013/018

@misc{cryptoeprint:2013:018,
    author = {Jae Hong Seo and Keita Emura},
    title = {Efficient Delegation of Key Generation and Revocation Functionalities in Identity-Based Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2013/018},
    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.