Cryptology ePrint Archive: BibTeX Citation of Report 2014/540

@misc{cryptoeprint:2014:540,
    author = {Abhijith P. S and  Dr. Manish Goswami and  S. Tadi and Kamal Pandey},
    title = {Optimized Architecture for AES},
    howpublished = {Cryptology ePrint Archive, Report 2014/540},
    year = {2014},
    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.