Cryptology ePrint Archive: BibTeX Citation of Report 2012/035

@misc{cryptoeprint:2012:035,
    author = {Andrey Bogdanov, Lars R. Knudsen, Gregor Leander, Francois-Xavier Standaert, John Steinberger, Elmar Tischhauser},
    title = {Key-Alternating Ciphers in a Provable Setting: Encryption Using a Small Number of Public Permutations},
    howpublished = {Cryptology ePrint Archive, Report 2012/035},
    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.