Cryptology ePrint Archive: BibTeX Citation of Report 2013/440

@misc{cryptoeprint:2013:440,
    author = {Mitsugu Iwamoto and Junji Shikata},
    title = {Revisiting Conditional R\'enyi Entropies and Generalizing Shannon's Bounds in Information Theoretically Secure Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2013/440},
    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.