Cryptology ePrint Archive: BibTeX Citation of Report 2012/358

@misc{cryptoeprint:2012:358,
    author = {Gilles Piret and Thomas Roche and Claude Carlet},
    title = {PICARO - A Block Cipher Allowing Efficient Higher-Order Side-Channel Resistance  -- Extended Version --},
    howpublished = {Cryptology ePrint Archive, Report 2012/358},
    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.