Cryptology ePrint Archive: BibTeX Citation of Report 2012/460

@misc{cryptoeprint:2012:460,
    author = {Yohei Watanabe and Takenobu Seito and Junji Shikata},
    title = {Information-Theoretic Timed-Release Security: Key-Agreement, Encryption, and Authentication Codes},
    howpublished = {Cryptology ePrint Archive, Report 2012/460},
    year = {2012},
    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.