Cryptology ePrint Archive: BibTeX Citation of Report 2007/240

@misc{cryptoeprint:2007:240,
    author = {George I. Davida and Jeremy A. Hansen},
    title = {A Four-Component Framework for Designing and Analyzing Cryptographic Hash Algorithms},
    howpublished = {Cryptology ePrint Archive, Report 2007/240},
    year = {2007},
    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.