Cryptology ePrint Archive: BibTeX Citation of Report 2011/213

@misc{cryptoeprint:2011:213,
    author = {M.R. Albrecht and P. Farshim and  K.G. Paterson and G.J. Watson},
    title = {On Cipher-Dependent Related-Key Attacks in the Ideal-Cipher Model},
    howpublished = {Cryptology ePrint Archive, Report 2011/213},
    year = {2011},
    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.