Cryptology ePrint Archive: BibTeX Citation of Report 2013/350

@misc{cryptoeprint:2013:350,
    author = {Paul Baecher and Pooya Farshim and Marc Fischlin and Martijn Stam},
    title = {Ideal-Cipher (Ir)reducibility for Blockcipher-Based Hash Functions},
    howpublished = {Cryptology ePrint Archive, Report 2013/350},
    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.