Cryptology ePrint Archive: BibTeX Citation of Report 2002/041

@misc{cryptoeprint:2002:041,
    author = {Eli Biham and Orr Dunkelman and Nathan Keller},
    title = {New Results on Boomerang and Rectangle Attack},
    howpublished = {Cryptology ePrint Archive, Report 2002/041},
    year = {2002},
    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.