Cryptology ePrint Archive: BibTeX Citation of Report 2014/438

@misc{cryptoeprint:2014:438,
    author = {Mihir Bellare and Kenneth Paterson and Phillip Rogaway},
    title = {Security of Symmetric Encryption against Mass Surveillance},
    howpublished = {Cryptology ePrint Archive, Report 2014/438},
    year = {2014},
    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.