Cryptology ePrint Archive: BibTeX Citation of Report 2015/540

@misc{cryptoeprint:2015:540,
    author = {Gaurav Bansod, Narayan Pisharoty, and Abhijit Patil},
    title = {PICO: An Ultra lightweight and Low power encryption design for pervasive computing},
    howpublished = {Cryptology ePrint Archive, Report 2015/540},
    year = {2015},
    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.