Cryptology ePrint Archive: BibTeX Citation of Report 2005/321

@misc{cryptoeprint:2005:321,
    author = {Liam Keliher and Jiayuan Sui},
    title = {Exact Maximum Expected Differential and Linear Probability for 2-Round Advanced Encryption Standard (AES)},
    howpublished = {Cryptology ePrint Archive, Report 2005/321},
    year = {2005},
    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.