Cryptology ePrint Archive: BibTeX Citation of Report 2013/059

@misc{cryptoeprint:2013:059,
    author = {Ayesha Khalid and Deblin Bagchi and Goutam Paul and Anupam Chattopadhyay},
    title = {Optimized GPU Implementation and Performance Analysis of HC Series of Stream Ciphers},
    howpublished = {Cryptology ePrint Archive, Report 2013/059},
    year = {2013},
    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.