Cryptology ePrint Archive: BibTeX Citation of Report 2012/426

@misc{cryptoeprint:2012:426,
    author = {Ed Kendall and Michelle Kendall and Wilfrid S. Kendall},
    title = {A Generalised Formula for Calculating the Resilience of Random Key Predistribution Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2012/426},
    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.