Cryptology ePrint Archive: BibTeX Citation of Report 2012/234

@misc{cryptoeprint:2012:234,
    author = {Jiali Choy, Huihui Yap, Khoongming Khoo, Jian Guo, Thomas Peyrin, Axel Poschmann, Chik How Tan},
    title = {SPN-Hash: Improving the Provable Resistance Against Differential Collision Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2012/234},
    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.